(NmATEMATI^ESKAQ MYSLX dREWNEJ rUSI (B/s - (NsIMONOW(B, (Nr\M aLEKSANDROWI^s ((NmOSKWA (B:s (NnAUKA(B,s, 1977)
Keywords: (NmATEMATIKAs