Lopushanskaya, G. P. “Solution of Boundary-Value Problems for Elliptic Equations in the Space of Distributions”. Ukrains’kyi Matematychnyi Zhurnal 51, no. 2 (February 25, 1999): 190–203. Accessed February 17, 2026. https://umj.imath.kiev.ua/index.php/umj/article/view/4598.