(NoBYKNOWENNYE DIFFERENCIALXNYE URAWNENIQ (B/s - (N|LXSGOLXC(B, (NlEW |RNESTOWI^s ((NmOSKWA (B:s (NgOSTEHIZDAT(B,s, 1954)
Keywords: (NdIFFERENCIALXNYE URAWNENIQs