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AUTHOR : Torrisi M. |
1. Differential
Invariants for a Class of Nonlinear Wave Equations
M.Torrisi,
A.Valenti (Dipartimento di Matematica e Informatica, University of Catania,
Catania, Italy); N.H.Ibragimov (Research Centre ALGA: Advances in Lie Group
Analysis, Department of Health, Science and Mathematics, Blekinge Institute of
Technology, Karlskrona, Sweden)
2. On Certain Equivalence
Transformations
M.Torrisi
(Department of Mathematics and Informatics, University of Catania, Catania,
Italy)