Help determine authorship!

[SergeiSK]

Help identify the author of this work here. This canvas, oil, 61 x 87.6 cm The work is likely 1960. And most of all rights and semi-circle of nonconformist artists of those years. Signature and any inscriptions no. Work from the collection of an American reporter of the famous magazine, who worked in those years in the Soviet Union.
Who could it be? Yakovlev, Zverev .... : confused:
Tell me, plz ....