(NpO^WY I BIOLOGI^ESKAQ PRODUKTIWNOSTX (B:s (NsBORNIK NAU^NYH TRUDOW (B/s - (NlENINGRADSKIJ GOSUDARSTWENNYJ PEDAGOGI^ESKIJ INSTITUT IM(B. (Na(B.(Ni(B. (NgERCENAs ((Nl(B. :s (Nb(B. (NI(B.,s, 1973)
Keywords: (NpO^WYs