https://www.academia.edu/16993329/Choref_M._M._2015._The_history_of_Byzantine_Taurica_on_the_basis_of_numismatic_data_Materials_in_Archaeology_and_History_of_Ancient_and_Medieval_Crimea._Suppl._1._Tyumen_Nizhnevartovsk_Nizhnevartovsk_state_university_Publ._in_Russian_