(NwY^ISLIMYE INWARIANTY W TEORII ALGEBRAI^ESKIH SISTEM (B:s (NsBORNIK NAU^NYH STATEJ (B/s - (NrEMESLENNIKOW(B, (Nw(B.(Nn(B.s ((NnOWOSIBIRSK (B:s (Nb(B. (NI(B.,s, 1987)
Keywords: (NkOMBINATORNYJ ANALIZs