(NpROEKTIWNYE METODY ISSLEDOWANIQ LI^NOSTIs (NU^EBNOE POSOBIE DLQ STUDENTOW WUZOWs - (NsOKOLOWA(B,(Ne(B. (Nt(B.s (NeLENA tEODOROWNAs ((Nm(B.s (NiZD(B-(NWO mgus, 1980)