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First Record of Sexual Dimorphism in Toxasterid Echinoid Heteraster from the Early Cretaceous Deposits of the Kopet-Dagh Basin,NE Iran
Authors:Hossein KAMYABI SHADAN  Morteza TAHERPOUR KHALIL-ABAD
Institution:Exploration Directorate of the National Iranian Oil Company, Tehran, Iran; Young Researchers and Elite Club, Mashhad Branch, Islamic Azad University, Mashhad, Iran
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