Igina Yu. F. The casus of Ivan the Terrible helmet: To the problem statement Written by Сосницкий Дмитрий Александрович on 22 December 2014.
Igina, Yu. F. On dynastic helmets, chichaks and caps: in response to S. N. Bogatyrev’s article «The helmet of Ivan the Terrible in the context of the court culture» Written by Сосницкий Дмитрий Александрович on 02 July 2015.
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