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- [1] RANGES OF CERTAIN WEAKLY NON-LINEAR ELLIPTIC PARTIAL-DIFFERENTIAL EQUATIONS JOURNAL DE MATHEMATIQUES PURES ET APPLIQUEES, 1978, 57 (04): : 351 - 366
- [5] THEORY OF HIGHER INFINITESIMAL SYMMETRIES OF NON-LINEAR PARTIAL-DIFFERENTIAL EQUATIONS DOKLADY AKADEMII NAUK SSSR, 1979, 248 (02): : 274 - 278
- [6] APPLICATION OF NEWMAN TECHNIQUE TO COUPLED, NON-LINEAR PARTIAL-DIFFERENTIAL EQUATIONS INDUSTRIAL & ENGINEERING CHEMISTRY FUNDAMENTALS, 1980, 19 (04): : 438 - 440
- [7] ON THE REGULARITY OF WEAK SOLUTIONS TO NON-LINEAR ELLIPTIC-SYSTEMS OF PARTIAL-DIFFERENTIAL EQUATIONS JOURNAL FUR DIE REINE UND ANGEWANDTE MATHEMATIK, 1980, 316 : 140 - 159
- [8] ON A CLASS OF NON-ELLIPTIC LINEAR PARTIAL-DIFFERENTIAL EQUATIONS ACTA MATHEMATICA ACADEMIAE SCIENTIARUM HUNGARICAE, 1981, 37 (04): : 395 - 398