Burskii, V. P. (1996) “On boundary-value problems for a second-order differential equation with complex coefficients in a plane domain”, Ukrains’kyi Matematychnyi Zhurnal, 48(11), pp. 1457-1467. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5199 (Accessed: 19May2024).