(NpROTIWO\ROZIONNAQ STOJKOSTX PO^W (B/s - (NkUZNECOW(B, (NmIHAIL sERGEEWI^s ((Nm(B. :s (NiZD(B. (NmOSK(B. (NUN(B-(NTA(B,s, 1981)
(NlIT(B. (NS(B. : 124-134s
Keywords: (NsELXSKOHOZQJSTWENNAQ MELIORACIQs