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- [3] POTENTIAL REPRESENTATION OF AN ASYMPTOTIC SOLUTION OF THE EQUATION DELTA-DELTA-U-KAPPA-2-DELTA-U=F ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK, 1982, 62 (01): : 15 - 25
- [4] THE FUNDAMENTAL SOLUTION OF CAUCHY PROBLEM FOR THE EQUATION DELTA-3-U-DELTA-X-DELTA-Y-DELTA-Z-1/4DELTA-U-DELTA-T=F(X, Y, Z, T) DOKLADY AKADEMII NAUK SSSR, 1959, 129 (06): : 1246 - 1249
- [10] THE SPECTRUM OF A CERTAIN OPERATOR AND THE DIRICHLET PROBLEM FOR THE EQUATION CLASS-2U+4DELTA-2/DELTA-T2+2DELTA-4U/DELTA-T4=F(X,Y,Z,T) DOKLADY AKADEMII NAUK SSSR, 1960, 132 (05): : 986 - 989