(NsOWREMENNOE SOSTOQNIE PROBLEMY SISTEMATIZACII HIMI^ESKIH \LEMENTOW(B:s ((Nk (B90-(NLETI@ PERIODI^(B. (NSISTEMY \LEMENTOW d(B. (Ni(B. (NmENDELEEWA(B) s - (NaGAFO[IN(B, (NnIKOLAJ pETROWI^(B.s ((NmOSKWA (B: s (Nb(B. (NI(B.,s, 1959)
Keywords: (NhIMI^ESKIE \LEMENTY (B- (NsISTEMATIZACIQs