\Bibitem{1} \paper Tenth All-Union Algebra Colloquium \jour Mat. Zametki \yr 1969 \vol 5 \issue 2 \pages 269 \mathnet{http://mi.mathnet.ru/mzm6832} \transl \jour Math. Notes \yr 1969 \vol 5 \issue 2 \pages 162 \crossref{https://doi.org/10.1007/BF01098318}