[1]
V. I. Lahno and S. V. Spichak, “Group classification of quasilinear elliptic-type equations. I. Invariance with respect to Lie algebras with nontrivial Levi decomposition”,
Ukr. Mat. Zhurn., vol. 59, no. 11, pp. 1532–1545, Nov. 2007, Accessed: Apr. 09, 2025. [Online]. Available:
https://umj.imath.kiev.ua/index.php/umj/article/view/3409