(NuSTOJ^IWOSTX UPRUGIH SISTEM (B/s - (NdINNIK(B, (NaLEKSANDR nIKOLAEWI^s ((NmOSKWA(B;s (NlENINGRAD (B.s (NiZD(B-(NWO I (B2-(NQ TIP(B. (NiZD(B-(NWA aKAD(B. (NNAUK sssr(B,s, 1950)
Keywords: (NuPRUGIE SISTEMY (B- (NuSTOJ^IWOSTX s