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Here is a source: Dairy Science Abstracts, 1981, 43. Also, Romanskaya, N.N.; Dyment, Bashirova et al. 1980 USSR patent.
Smetanka is made from cream with 10% fat (sounds like rich whole milk)....

I grew up in Minnesota, to which our family moved from Pereyaslav, Ukraine. There, we had Smetana, made by Oriental Dairy, which also made ricotta cheese and cottage cheese. It closed some years ago...