(NbORXBA KRESTXQN bOLGARII (B/s - (NgOROW(B, (NmIHAIL pETROWI^s ((NmOSKWA (B;s (NlENINGRAD (B:s (NgOS(B. (NIZD(B.,s, 1927)
Keywords: (NkRESTXQNSTWO W bOLGARIIs