(NlEKCII O GRUPPAH {EWALLE (B/s - (NsTEJNBERG(B, (NrOBERTs; (NbERN[TEJN(B, (Ni(B.(Nn(B.s; (NqKOWLEW(B, (Nn(B.(Nn(B.s; (NkIRILLOW(B, (Na(B.(Na(B.s ((NmOSKWA (B:s (NmIR(B,s, 1975)
R. Steinberg -
Keywords: (NmATEMATIKAs