(NdIFFERENCIALXNYE URAWNENIQ (B: /s - (NbERKOWI^(B, (Nl(B.(Nms; (NgOSUDARSTWENNYJ PEDAGOGI^ESKIJ INSTITUTs ((NrQZANX (B:s (NzNAK pO^ETA(B,s, 1982)
Keywords: (NdIFFERENCIALXNYE URAWNENIQs