00579naa#a2200169#i#450# EN\\bibl\100446 20250629211203.7 2413-1741 20250626b2025####ek#y0engy0150####ca RU THE DEFINITION OF «VIKING AGE»: GENESIS AND MAIN APPROACHES IN MODERN HISTORIOGRAPHY Journal article Simferopol V.I. Vernadsky Crimean Federal University 2025 16 с. Journal article local География. Биография. История. 9 Zhiryakov K. A. cfuv.editorum.ru