Bessudnova, M. B. The «Russian threat» in the Livonian Order's documentation from the 80s and early 90s of the 15th century Written by Сосницкий Дмитрий Александрович on 19 June 2014.
Popov V.E., Filjushkin A.I. Coadjuter's War and Pozvol Treaties of 1557 Written by Сосницкий Дмитрий Александрович on 08 November 2018.
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