Journal Paper

1. "Naqsh-i Kalantaran va Kad Khudayan dar mudiriat shahr va rusta az dawrah-i Safaviyah ta inqilab-i Islami"
   Abbas Ahmadvand
   Muslim Civilisations Abstracts (MCA) project,
2. "Bunyan-i hukumat-i Qajar nizami-i siyasi-i ili va divansalari-i mudirn"
   Abbas Ahmadvand
   Muslim Civilisations Abstracts (MCA) project,
3. "Nukhbigan i Siyasi Iran Az Enqelab i Mashrutiat ta Enqelab i Islamii"
   Abbas Ahmadvand
   Muslim Civilisations Abstracts (MCA) project,
4. "Ain-i Kishvardari dar ahdi vizarat-i Rashid al-Din Faz Allah Hamadani"
   Abbas Ahmadvand
   Muslim Civilisations Abstracts (MCA) project,
5. "Nizam-i hukumat-i Iran dar dauran-i islami"
   Abbas Ahmadvand
   Muslim Civilisations Abstracts (MCA) project,
6. "Nizam i Sultani az Didgah i Andishiye Siyasi i Shiah Dawreye Safaviyah va Qajariyah"
   Abbas Ahmadvand
   Muslim Civilisations Abstracts (MCA) project,
7. "Sultani System form Shia Pollitical Thoulght Point of View Safavid and Qajar Eras"
   Abbas Ahmadvand
   Muslim Civilisations Abstracts (MCA) project,
8. "Nizam e Siyasi wa Dawlat dar islam"
   Abbas Ahmadvand
   Muslim Civilisations Abstracts (MCA) project,
9. "Sazmane-i idari-i Kharazmshahiyan"
   Abbas Ahmadvand
   Muslim Civilisations Abstracts (MCA) project,
10. "Mulla Ali Kani"
    Abbas Ahmadvand
    The Encyclopedia of Islam Three, Vol. 2023-2, pp.4-6, 2023
11. "Alexandria, the Threshold of Egypt: A Comparative Study on Volney and Jabarti's Idea of Alexandria in the Late 18th Century"
    Kamal Keshik Nevos Razavi, Abbas Ahmadvand, Mina Moazzeni
    Journal of Islamic Thought and Civilization, Vol. 12, pp.96-113, 2022
12. "Imamiyya and Sira Writing in the Second and Fourth Centuries AH"
    Hadi Yaghoubzadeh, Abbas Ahmadvand
    Religious Inquiries, Vol. 11, pp.123-140, 2022
13. "Revealing gender discourses in the Quran: An integrative, dynamic and complex approach"
    Ghasem Darzi, Abbas Ahmadvand, Musa Nushi
    HTS TEOLOGIESE STUDIES-THEOLOGICAL STUDIES, Vol. 77, 2021
14. "Analysis of the Attribution of Tazkir?t Al-A'imato All?ma Muhammad B?qir al-Majlesi"
    Hadi Salehi zadeh, Ebrahim Noei, Abbas Ahmadvand
    Tourkish Journal of Shitte studies, Vol. 2, pp.52-70, 2020
15. "A Comprative Analysis of T.Noldeke and I.Goldziher, Towards a Shi,ite Interpretation"
    Abbas Ahmadvand, Seye Kamal Keshik Nevis Razavi
    Journal of Shia History, Vol. 2, pp.35-45, 2019
16. "Nizam- i Siyasi va Sazman haye Ijtimaei- i Iran dar Asr-i Qajar"
    Abbas Ahmadvand
    Muslim Civilisations Abstracts (MCA) project, 2014
17. "Religion and Persian Minature during the Reign of King Tahmasp as Two Sources for Political Legitimacy"
    , Abbas Ahmadvand,
    kufa review, pp.67-85, 2014
18. "Dawud al-Raqqi A Critical Survey of his Role in the Propagation of Shi a Teachings"
    Amir Momeni Hezaveh, Abbas Ahmadvand, Said Tavusi Masroor
    journal of shi a islamic studies لندن, Vol. 4, pp.429-446, 2011
19. "The Scholary Contributions of Jabir ibn Yazid al- Ju fi"
    Abbas Ahmadvand, Sayyid Hesamuddin Ale Yasin, Said Tavusi Masrur
    journal of shi a islamic studies لندن, Vol. 3, pp.261-281, 2010
20. "The Origins of the Crown Prince System in Muslim History"
    Abbas Ahmadvand
    international journal of shi i islamic studies امريكا -نيويورك, Vol. 3, pp.75-103, 2005
21. "An Iranian Point of View of Shi i Studies in the West"
    Abbas Ahmadvand
    international journal of shi i islamic studies امريكا -نيويورك, Vol. 1, pp.153-184, 1998
22. ""
    Seyed Saeed Hosseini, Abbas Ahmadvand
    
23. ""
    Abbas Ahmadvand,
    
24. ""
    Abbas Ahmadvand
    
25. ""
    Abbas Ahmadvand
    
26. ""
    Abbas Ahmadvand
    Vol. 33, pp.510-513, 2025
27. ""
    Abbas Ahmadvand, Behnaz Keybakhi
    Vol. 25, pp.197-250, 2025
28. ""
    Zahra Salimi, Abbas Ahmadvand, Mahboobeh Sharafi
    Vol. 18, pp.1-30, 2025
29. "The ecological footprints in al Sira"
    Farhad Nemati, Abbas Ahmadvand
    Vol. 9, pp.87-102, 2024
30. ""
    Sajedeh Isnaashari, Abbas Ahmadvand
    Vol. 9, pp.31-47, 2024
31. ""
    Mohammad Reza Mohammadi, Abbas Ahmadvand, Abd Allah Farahi
    Vol. 13, pp.5-26, 2024
32. "Ecological Humanities"
    Abbas Ahmadvand, Shahla Lajamorak Ramechari, Behnaz Keybakhi
    Vol. 16, pp.5-38, 2024
33. ""
    Faezeh Aghighi, Abbas Ahmadvand
    Vol. 18, pp.79-100, 2024
34. ""
    Abbas Ahmadvand
    Vol. 33, pp.208-209, 2024
35. "Analyzing the Manifestations of Popular Religion(The Use of Istikhara During the Period of Naser Al-Din Shah to Muhammad Ali Shah Qajar)"
    Zahra Salimi, Abbas Ahmadvand, Sina Forouzesh
    Vol. 14, pp.113-135, 2024
36. ""
    Abbas Ahmadvand
    Vol. 32, pp.173-174, 2024
37. ""
    Abbas Ahmadvand
    Vol. 32, pp.107-109, 2024
38. "Ecological Civilization"
    Abbas Ahmadvand, Eskandar Zand
    Vol. 8, pp.19-23, 2023
39. ""
    Abbas Ahmadvand
    Vol. 31, pp.672-673, 2023
40. ""
    Mehrdad Jalili Kia, Abbas Ahmadvand, Reza Shabani samghabadi, Gholamhosein Zargarinezhad
    Vol. 5, pp.625-647, 2023
41. ""
    Abbas Ahmadvand
    Vol. 31, pp.117-118, 2023
42. ""
    Abbas Ahmadvand
    Vol. 31, pp.546-551, 2023
43. ""
    Seyede Fatemeh Miraghsi Rudaki, Abbas Ahmadvand, mohamadreza barani
    Vol. 16, pp.71-95, 2023
44. ""
    Abbas Ahmadvand
    Vol. 31, pp.67-69, 2023
45. ""
    F Vafaei, Rezaei R, Abbas Ahmadvand
    Vol. 17, pp.85-109, 2022
46. ""
    Seyede Fatemeh Miraghsi Rudaki, Abbas Ahmadvand, Mohammad Reza Barani
    Vol. 1, pp.81-102, 2022
47. "The Narrations of the Murder of Mardawij-i-Ziari"
    Abbas Ahmadvand
    Vol. 25, pp.1-31, 2021
48. ""
    Farhad Nemati, Abbas Ahmadvand, Mohammad Haji Taghi
    Vol. 54, pp.241-259, 2021
49. "The Evolution of Tughra in Islamic Civilization"
    Abbas Ahmadvand
    Vol. 11, pp.73-94, 2021
50. "Shaykh Said"
    Abbas Ahmadvand
    Vol. 28, pp.335-335, 2021
51. "Historical Rocognition of the Meaning and Scope of the Term Iraq -i- Ajam(Up to the End of Ilkhanid Period)"
    Abbas Ahmadvand
    Vol. 9, pp.45-60, 2021
52. ""
    seyed Kamal Keshik Nevis, Abbas Ahmadvand
    Vol. 53, pp.239-250, 2020
53. "The Structure and Administrative Managment of Astan e Quds e Razavi in Pahlavi Era"
    Shahnaz Shaabanipur, Abbas Ahmadvand, Sina Forouzesh
    History, Vol. 15, pp.127-131, 2020
54. ""
    saadat ghazakfari, Morteza Semnoon, Abbas Ahmadvand, mohamad abbasi
    Health Biotechnology and Biopharma, Vol. اول, pp.251-282, 2020
55. ""
    Abbas Ahmadvand
    IRAN NAMAG, Vol. 5, pp.129-140, 2020
56. "Recognition of Man and its Civilizational Application, Emphasizing the Narrations of Al-kaf"
    Ali Qasemi, Hadi Kazemzadeh Mazrae, esmaiel darabkalaie, Abbas Ahmadvand
    Vol. 4, pp.277-300, 2020
57. ""
    Hadi Salehi zadeh, Ebrahim Noei, Abbas Ahmadvand
    Vol. 14, pp.137-156, 2020
58. "Der historiografische Wert von Texten zur Islamischen Rechtswissenschaft:"
    Mina Moazzeni, Kamal Keshiknevis Razavi , Abbas Ahmadvand
    Journal of Law & Islam, Vol. 12, pp.85-102, 2020
59. ""
    shahnaz shabani pour, Abbas Ahmadvand, sina frouzash
    Vol. 9, pp.113-133, 2020
60. "Shalbatara"
    Abbas Ahmadvand
    Vol. 27, pp.464-465, 2019
61. ""
    Abbas Ahmadvand
    Vol. 4, pp.27-30, 2019
62. ""
    Mahdy Sehat, Abbas Ahmadvand
    Vol. 8, pp.153-172, 2019
63. "Shibam"
    Abbas Ahmadvand
    Vol. 26, pp.571-573, 2019
64. "Saymarah"
    Abbas Ahmadvand
    Vol. 25, pp.773-774, 2019
65. "Sayun"
    Abbas Ahmadvand
    Vol. 26, pp.180-182, 2019
66. "Shah"
    Abbas Ahmadvand
    Vol. 26, pp.385-387, 2019
67. ""
    Q Garavand, M.T Rahnemaei, H. Fallah Tootkar, Abbas Ahmadvand
    Vol. 8, pp.121-145, 2018
68. ""
    Hadi Yaghoubzadeh, Mohammad mahdi Baba poor gol afshani, Abbas Ahmadvand
    Vol. 7, pp.27-44, 2018
69. ""
    Hadi Yaghoubzadeh, Abbas Ahmadvand, Mohammad mahdi Baba poor gol afshani
    Vol. 8, pp.93-118, 2018
70. ""
    Abbas Ahmadvand
    Vol. 18, pp.271-290, 2018
71. ""
    seyed kamal keshiknevis razavi, Abbas Ahmadvand, mohammadrahim Beyraqi
    Vol. 20, pp.111-126, 2017
72. ""
    Abbas Ahmadvand
    Vol. 23, pp.422-424, 2017
73. ""
    Abbas Ahmadvand, Hadi Yaghoubzadeh, Mohammad mahdi Baba poor gol afshani
    Vol. 48, pp.93-110, 2017
74. ""
    Zohair Siamian Gorji, Abbas Ahmadvand, Fatima Kargar Jahromi
    Vol. 7, pp.189-218, 2017
75. ""
    Abbas Ahmadvand
    Vol. 24, pp.645-647, 2017
76. ""
    Zohair Siamian Gorji, Abbas Ahmadvand, Somayeh Shirinazimi
    Vol. 6, pp.57-82, 2017
77. ""
    Abbas Ahmadvand
    Vol. 21, pp.61-62, 2017
78. "Riyadh"
    Abbas Ahmadvand
    Vol. 21, pp.37-41, 2017
79. "Zibatara"
    Abbas Ahmadvand
    Vol. 21, pp.246-247, 2017
80. "Zabid"
    Abbas Ahmadvand
    Vol. 21, pp.256-259, 2017
81. ""
    Abbas Ahmadvand
    Vol. 26, pp.5-18, 2017
82. "Zubara"
    Abbas Ahmadvand
    Vol. 21, pp.223-226, 2017
83. ""
    Abbas Ahmadvand
    Vol. 10, pp.21-30, 2017
84. ""
    Abbas Ahmadvand
    Vol. 7, pp.109-124, 2016
85. ""
    Abbas Ahmadvand,
    Vol. 10, pp.61-76, 2016
86. ""
    Abbas Ahmadvand, mohamad abasi
    Vol. 6, pp.111-119, 2016
87. ""
    seid kamal keshish kevis razavi, Abbas Ahmadvand
    Vol. 7, pp.99-131, 2016
88. ""
    Abbas Ahmadvand
    Vol. 6, pp.27-41, 2016
89. ""
    Abbas Ahmadvand
    Vol. 7, pp.49-68, 2016
90. ""
    Abbas Ahmadvand, Zohair Siamian Gorji, Fatima Kargar Jahromi
    Vol. 8, pp.1-22, 2016
91. ""
    Abbas Ahmadvand, Zohair Siamian Gorji, Fatima Kargar Jahromi
    Vol. 8, pp.23-48, 2016
92. ""
    Abbas Ahmadvand, Shahram Yosefifar,
    Vol. 1, pp.1-12, 2016
93. ""
    Abbas Ahmadvand
    pp.334-337, 2016
94. ""
    Abbas Ahmadvand
    pp.687-688, 2016
95. ""
    Abbas Ahmadvand
    Vol. 4, pp.1-10, 2016
96. "Raqqa"
    Abbas Ahmadvand
    pp.235-239, 2016
97. ""
    Abbas Ahmadvand, , Mohammadhassan Bahadori
    Vol. 1, pp.1-12, 2016
98. "Rafah"
    Abbas Ahmadvand
    pp.182-185, 2016
99. ""
    Abbas Ahmadvand
    Vol. 2, pp.78-80, 2015
100. "The Contrafrentia Plan and its Role in Promoting Quranic Studies in the West"
     Abbas Ahmadvand,
     Vol. 1, pp.103-119, 2015
101. ""
     Abbas Ahmadvand
     Vol. 19, pp.602-604, 2015
102. "Rashaida"
     Abbas Ahmadvand
     Vol. 19, pp.816-818, 2015
103. ""
     Abbas Ahmadvand
     Vol. 19, pp.889-890, 2015
104. "Rustaq"
     Abbas Ahmadvand
     Vol. 19, pp.773-774, 2015
105. "Zamar"
     Zahra RezaieNasab, Abbas Ahmadvand
     Vol. 18, pp.824-825, 2014
106. "Duluk"
     Abbas Ahmadvand
     Vol. 18, pp.62-63, 2014
107. "Doha"
     Abbas Ahmadvand
     Vol. 18, pp.292-295, 2014
108. ""
     Abbas Ahmadvand
     Vol. 18, pp.533-535, 2014
109. "Dali"
     Abbas Ahmadvand
     Vol. 18, pp.65-66, 2014
110. "Qahramana phenomenon in Abbasid era 232- 334"
     Abbas Ahmadvand, Zahra Amiri
     Vol. 2, pp.1-17, 2014
111. "Dawraq"
     Abbas Ahmadvand,
     Vol. 18, pp.300-302, 2014
112. ""
     Abbas Ahmadvand
     Vol. 46, pp.129-144, 2013
113. "The Role of Iranians in writing the Encyclopaedia of Islam"
     Abbas Ahmadvand
     Vol. 16, pp.1-18, 2013
114. "Bayt al- Hikma"
     Abbas Ahmadvand
     Vol. 68, pp.77-80, 2013
115. "Day"
     Abbas Ahmadvand
     Vol. 17, pp.317-317, 2013
116. "Dabiq"
     Abbas Ahmadvand
     Vol. 17, pp.365-366, 2013
117. "A Study on JAbir b. YAzid al- Ju fi attributed Ghuluw"
     Abbas Ahmadvand, Said Tavusi Masrur
     Vol. 2, pp.1-24, 2012
118. "Umm al Moktader s political and social life"
     Abbas Ahmadvand, Zahra Amiri
     Vol. 2, pp.130-150, 2012
119. "Islam and historical experience"
     Abbas Ahmadvand
     Vol. 1, pp.12-19, 2012
120. "Barthelemy d Herbelot and his Bibliotheque Orientale"
     Abbas Ahmadvand, Amir Momeni Hezaveh
     Vol. 8, pp.205-223, 2012
121. "Quranic Ayat minting on the Islamic Coins in the Umayyad era and Muslims reaction to it"
     Abbas Ahmadvand, Said Tavusi MAsrur
     Vol. 93, pp.23-40, 2012
122. "Dar al- Nadwa"
     Abbas Ahmadvand
     Vol. 16, pp.734-735, 2012
123. "khokand"
     Abbas Ahmadvand
     Vol. 16, pp.476-478, 2012
124. "Change in the Concept of Orientalism and Lack of Attention to it"
     Abbas Ahmadvand
     Vol. 1, pp.5-23, 2011
125. ""
     Abbas Ahmadvand, Said TAvusi Masrur
     Vol. 3, pp.59-76, 2011
126. "Encyclopedia Islamica Vol. 1"
     Abbas Ahmadvand
     Vol. 22, pp.116-118, 2011
127. "The Role of Ghulat in Intorducing Jabir al-Ju fi as a Ghali"
     Abbas Ahmadvand, Said Tavusi Masrur
     Vol. شانردهم, pp.149-170, 2011
128. "Dabiq and its Economic role"
     Abbas Ahmadvand, Said Tavusi Masrur
     Vol. 2, pp.7-14, 2010
129. "The Position and Importance of Coins in Abbasid Da wa"
     Sayyid Ahmad Reza Khezri, Abbas Ahmadvand
     Vol. 87, pp.45-65, 2010
130. "Suhrawardi s Will to his Son"
     Abbas Ahmadvand, Mohsen Jahed
     Vol. 2, pp.11-18, 2010
131. "Islamic Coins A Durability Factor of the Painting in the Middle Ages"
     Abbas Ahmadvand
     Vol. 1, pp.17-30, 2010
132. "Typology of Uprisings seeking Vengeance for Imam Husain A.S The Penitents and Mokhtar"
     Saadat Ghazanfari, Abbas Ahmadvand, Bahram Bahrami
     Vol. 7, pp.17-29, 2010
133. "Buraq Baba An Unknown Sufi"
     Sahar Kavandai, Abbas Ahmadvand, Amir Momeni Hezaveh
     Vol. 43, pp.73-83, 2010
134. "Cultural History and you"
     Abbas Ahmadvand
     Vol. 2, pp.24-27, 2010
135. "Cultural History"
     Abbas Ahmadvand
     Vol. 2, pp.24-26, 2010
136. "Islamic Studies in the West"
     Abbas Ahmadvand
     Vol. 1, pp.38-43, 2010
137. "Islamic Studies in the West past present and future"
     Abbas Ahmadvand
     Vol. 13, pp.89-93, 2010
138. "Crown Prince Conditions"
     Abbas Ahmadvand, Saeed Tavusi Masrur
     Vol. 1, pp.6-18, 2009
139. "Monedas de Abu Moslem de Jorasan"
     Sayyid Ahmad Reza Khezri, Abbas Ahmadvand
     Iranologia IIكتاب مجموعه مقالات, Vol. 2, pp.83-97, 2009
140. "Wali al Ahd Education in Ummayd Caliphate and irst Abbasid era"
     Abbas Ahmadvand
     Vol. 16, pp.13-29, 2009
141. ""
     Abbas Ahmadvand,
     pp.7-18, 2009
142. "A Reflection on the Education and Research of Historical Geography in Iran"
     Abbas Ahmadvand
     Vol. 10, pp.41-63, 2009
143. "The Entry of Imam Hasan al- Askari in EI"
     Abbas Ahmadvand, Said Tavusi Masrur
     Vol. 9, pp.149-170, 2009
144. "Hadath"
     Abbas Ahmadvand
     Vol. 12, pp.698-699, 2008
145. "Churim"
     Abbas Ahmadvand
     pp.164-165, 2008
146. "Emergence Functions Duties and Previleges of Vali Ahd in the first centureis of Islam"
     Ahamd Reza Khezri, Abbas Ahmadvand
     Vol. 4, pp.73-84, 2008
147. "Orientalists Studies about Nahj al- Balagha"
     Abbas Ahmadvand, Sahar Kavandi
     Vol. 2, pp.330-343, 2008
148. "Habish"
     Abbas Ahmadvand
     pp.508-509, 2008
149. ""
     Abbas Ahmadvand
     pp.309-325, 2008
150. "Crown Prince Phenomenon in Islam and its origins"
     Sayyid Ahmad Reza Khezri, Sayyid Jamal Musavi, Abbas Ahmadvand
     Vol. 13, pp.49-71, 2006
151. ""
     Abbas Ahmadvand
     pp.92-94, 2003
152. ""
     Abbas Ahmadvand
     pp.2-8, 2003

Conference Paper

1. "Marafat Falahat/ Agricultural Knowledge,a work about the native knowledge of Iranians about the importance of the environment in the 10th century"
   Shahla Lajmorak Rameh’chari, Abbas Ahmadvand
   4th World Congress of Environmental History, No 4 , pp.1-17, 2024
2. "The Bioethical approach to Hima Institution"
   Abbas Ahmadvand, Ghasem Darzi
   The 17th World Congress of Bioethics, No 17 , pp.1-10, 2024
3. "The role of religion in the emergence and durability of Hamadan architectural monuments on the Silk Roads"
   Abbas Ahmadvand
   , pp.1-20, 2019
4. "Religions and spiritualities along Silk Roads with focus on Iran"
   Abbas Ahmadvand
   Interactive Atlas of Cultural Interactions along the Silk Roads, No 1 , pp.1-11, 2019
5. "China and Islamic World as Narrated By Sulayman Sirafi"
   Abbas Ahmadvand
   China and Islamic World, No 1 , pp.434-443, 2015
6. "The Publication of the glorious Quran in the West"
   Abbas Ahmadvand
   The 5th Asia - Pasific Industrial Engineering and Management Systems Conference APIEMS 2004, No 2 , pp.256-261, 2004
7. ""
   Zahra Dalochi, Abbas Ahmadvand
   , 2024
8. ""
   Abbas Ahmadvand
   Cultural History in Iran,Problems,Concepts,Methods and Challenges, 2023
9. "Yahya b.Zayd Uprising in Khurasan and its Consequences"
   Saadat Ghazanfari, Abbas Ahmadvand
   Yahya ibn Zayd Conference, No 1 , pp.139-161, 2022
10. "Za,firaniya (Saffroni) Caravanserai; A symbol of Iran and China Trade in Medieval Times"
    Abbas Ahmadvand, Mina Moazzeni
    Cultural Dialogue between Iran and China, 2021
11. ""
    Abbas Ahmadvand
    , 2020
12. ""
    qamar mardani, Abbas Ahmadvand
    Ethics, Theology and Pandmic diseases, pp.149-149, 2020
13. ""
    Abbas Ahmadvand
    , pp.37-37, 2019
14. ""
    Abbas Ahmadvand
    , 2018
15. "Displacement of Firdawsi Saadi Mawlawi and Hafez in the Mentality and Language of Iranian People"
    Abbas Ahmadvand
    , No 8 , pp.36-37, 2018
16. ""
    Abbas Ahmadvand
    2th international scientific conference of Garmian university, 2017
17. "Quranic Studies in 20th Century in the West A Field of Interdisciplinary Studies Case Study Interpretation Studies"
    Sayyed Kamal Keshiknevis Razavi, Abbas Ahmadvand
    The International Conference on Interdisciplinary Quranic Studies, 2017
18. ""
    Abbas Ahmadvand
    , 2016
19. ""
    Abbas Ahmadvand
    , No 1 , pp.205-205, 2015
20. "Historical Geography Texts and Persian Language Heritage"
    Abbas Ahmadvand
    , pp.1-351, 2015
21. "Sira writing among the Shi as Paradigms and Challenges"
    Abbas Ahmadvand
    , No 1 , pp.12-12, 2013
22. "Quranic Studies in the West Approches Methods and Themes."
    Abbas Ahmadvand, Seyed Kamal Keshik Nevis e Razavi
    , No 1 , pp.17-37, 2013
23. "Historical Geography of Dawraq"
    Abbas Ahmadvand
    , No 3 , pp.4-4, 2012
24. "Historical Geography of Saruq and its Haftadu do tan Imam Zadas"
    Behzad Lahuti, Abbas Ahmadvand
    , No 1 , pp.10-23, 2007