Fushchich VI, Chopik VI. Conditional symmetry and new representations of the Galilean algebra for nonlinear parabolic equations. Ukr. Mat. Zhurn. [Internet]. 1993Oct.25 [cited 2024Nov.24];45(10):1433–1443. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5948