G. P. Lopushanskaya, “Generalized boundary values of solutions of quasilinear elliptic equations with linear principal part”, Ukr. Mat. Zhurn., vol. 59, no. 12, pp. 1674–1688, Dec. 2007, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3421