(NpROBLEMA \KWIWALENTNOSTI OBYKNOWENNYH LINEJNYH DIFFERENCIALXNYH OPERATOROW (B/s - (NfAGE(B, (NmIHAIL kONSTANTINOWI^s; (NnAGNIBIDA(B, (NnIKOLAJ iWANOWI^s ((NnOWOSIBIRSK (B:s (NnAUKA(B. (NsIB(B. (NOTD(B-(NNIE(B,s, 1987)
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Keywords: (NoPERATORY (B((NMAT(B.) (NDIFFERENCIALXNYEs