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On the way to establishing diplomatic relations: the bolsheviks and the kaiser's Germany in 1918 (Berlin mission of plenipotentiary Ioffe 1918. Documents / author is the compiler A.Y. Vatlin, L.V. Lannick, T. Penter. Moscow: Political Encyclopedia, 2023. 623 p.)
Sergei V. Artamoshin (Mon,) studied this question.