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- [2] LIE SYMMETRY GROUPS AND SEPARATION OF VARIABLES FOR LINEAR PARTIAL-DIFFERENTIAL EQUATIONS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1976, 23 (01): : A108 - A109
- [3] SUBGROUPS OF LIE-GROUPS AND SYMMETRY REDUCTION FOR NONLINEAR PARTIAL-DIFFERENTIAL EQUATIONS LECTURE NOTES IN PHYSICS, 1984, 201 : 114 - 118
- [5] EXAMPLES OF INVARIANCE GROUPS OF PARTIAL-DIFFERENTIAL EQUATIONS COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1974, 279 (05): : 165 - 168
- [8] SOLUTION OF PARTIAL-DIFFERENTIAL EQUATIONS USING TRANSFORMATION GROUPS ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK, 1979, 59 (03): : T42 - T44
- [9] OTHER EXAMPLES OF INVARIANCE GROUPS OF PARTIAL-DIFFERENTIAL EQUATIONS COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1974, 279 (06): : 193 - 196