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- [2] ON THE EQUATION U'-F(DELTA-U)=0 BOLLETTINO DELLA UNIONE MATEMATICA ITALIANA, 1987, 1A (03): : 437 - 441
- [7] DIRICHLET PROBLEM FOR THE EQUATION DELTA-U=U-2 DOKLADY AKADEMII NAUK SSSR, 1960, 134 (04): : 769 - 772
- [8] ON EQUATIONS OF THE FORM DELTA-U=F(X,U,DU) MATHEMATICS OF THE USSR-SBORNIK, 1980, 113 (02): : 269 - 280