(NlINEJNYE DIFFERENCIALXNYE OPERATORY (B/s - (NnAJMARK(B, (NmARK aRONOWI^s ((NmOSKW(Ba :s (NgOSTEHIZDAT(B,s, 1954)
(NbIBLIOGR(B.: (NS(B. 341-346s
Keywords: (NoPERATORY (B((NMATEMATI^ESKIE(B) (NLINEJNYE(B, (NDIFFERENCIALXNYEs; (NoPERATORY (B((NMAT(B.) (NDIFFERENCIALXNYEs