Computer Algebra Application for Determining Lie and Lie-Bäcklund Symmetries of Differential Equations. - W. I. Fushchich; Vladimir V. Kornyak (J. Symb. Comput., 1989)

A Program for Symmetry Analysis of Differential Equations. - Vladimir V. Kornyak; W. I. Fushchich (ISSAC, 1991)