(NpROBLEMY U^EBNOGO RISUNKA (B/s - (NbERN[TEJN(B, (NmIHAIL dAWIDOWI^s ((NmOSKWAs (NlENINGRAD (B:s (NiSKUSSTWO(B,s, 1940)
Keywords: (NRISUNOKs