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Can socialists and communists co-operate?
Genri, Ėrnst, (1972)
Stroitelstvo socialzma v sssr i mezzdunarodnaja proletarskaja solidarnost. 1921-1937 gg.
Ozerov, Leonid Stepanovicz, (1972)
Meždunarodnoe vlijanie real'nogo socializma
Novopašin, Jurij Stepanovič, (1985)