Ospanov, K. N. “Coercive Solvability of a Generalized Cauchy-Riemann System in the Space $L_p (E)$”. Ukrains’kyi Matematychnyi Zhurnal 48, no. 11 (November 25, 1996): 1564–1569. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5210.