Marina Maratovna Imasheva, Dina Abdulbarovna Mustafina, Dmitriy Maratovich Yakupov, and Marat Salavatovich Gatin, Lenar Fargatovich Abzalov, Rail Ravilovich Fakhrutdinov. “The Causes of the Astrakhan Campaign of 1569”. Opción 350 (October 19, 2019): 807-818. Accessed December 5, 2025. http://www.produccioncientificaluz.org/index.php/opcion/article/view/29510.