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Symmetries and recursion operators for classical and supersymmetric differential equations
Krasil·ščik, I. S.
Bok Engelsk 2000
Symmetries and conservation laws for differential equations of mathematical physics
A.V. Bocharov ... [et al.], I.S. Krasil´s...
Bok Engelsk 1999
Geometry of jet spaces and nonlinear partial differential equations
Krasil·ščik, I. S.
Bok Engelsk 1986