A. P. Petravchuk, “On the sum of two Lie algebras with finite-dimensional commutants”, Ukr. Mat. Zhurn., vol. 47, no. 8, pp. 1089–1096, Aug. 1995, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5505