An L p -criterion of amenability for a locally compact group. Kopylov, Ya.A. — 2005 Sibirskie Ehlektronnye Matematicheskie Izvestiya [electronic only]
The five- and nine-lemmas in P-semi-abelian categories. Kopylov, Ya.A. — 2009 Sibirskij Matematicheskij Zhurnal
The Ker-Coker-sequence and its generalization in some classes of additive categories. Kopylov, Ya.A.; Kuz'minov, V.I. — 2009 Sibirskij Matematicheskij Zhurnal