Dijalʹnistʹ dyplomatyčnoï misiï Nimeččyny v Ukraïni z realizaciï umov Brestsʹkoho myrnoho dohovoru (berezenʹ-kvitenʹ 1918 r.) = The activities of the German diplomatic mission in Ukraine on the implementation of the peace treaty of Brest : (march-april 1918) - Pyrih, Ruslan Jakovyč 1941- (2018)