S. D. Ivasyshen and H. P. Ivasyuk, “Solonnikov parabolic systems with quasihomogeneous structure”, Ukr. Mat. Zhurn., vol. 58, no. 11, pp. 1501–1510, Nov. 2006, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3550