List of Articles Constancy Open Access Article Abstract Page Full-Text 1 - A Survey on frequency of equine Cryptosporidiosis in Ahvaz A.R Ghadrdan-Mashhadi حسین Hamidienjat پریسا Alizadehnia Open Access Article Abstract Page Full-Text 2 - America's Foreign Policy in the Fight against Terrorism: Kabul-Washington Security Pact Aims and Consequences Esmaeil Bibourdi کابک خبیزی محمد حسن شاه رضایی Open Access Article Abstract Page Full-Text 3 - Phenomenology of Change, Continuity and Constancy of the Concept of City and Memory in the Historical Center of Tehran from the Perspective of Architects, Historians and Artists seyed abdolhadi daneshpour Mehran Alalhesabi Mostafa Hosseini Koumleh