(NpROBLEMY OHRANY OKRUVA@]EJ SREDY (B:s (NsBORNIK NAU^NYH TRUDOW (B/s - (NaLYMOW(B, (NaLEKSANDR nIKOLAEWI^s ((NkIEW (B:s (Nsops ussr(B,s, 1977)
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Keywords: (N|KOLOGIQs; (NoHRANA OKRUVA@]EJ SREDYs