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- [6] ON THE CHARACTERS OF EXPONENTIAL SOLVABLE LIE-GROUPS ANNALES SCIENTIFIQUES DE L ECOLE NORMALE SUPERIEURE, 1984, 17 (01): : 1 - 29
- [9] SUBGROUPS OF LIE-GROUPS AND SYMMETRY REDUCTION FOR NONLINEAR PARTIAL-DIFFERENTIAL EQUATIONS LECTURE NOTES IN PHYSICS, 1984, 201 : 114 - 118