On homogeneous symmetries for evolution systems with constraints.
Čadek, Martin (eds.):
Proceedings of the 21st Winter School "Geometry and Physics".
Circolo Matematico di Palermo, Palermo, 2002.
Summary: The author obtains sufficient conditions of the finite independence and the commutativity for local as well as non-local homogeneous symmetries of a large class of $(1+1)$-dimensional evolution systems.