Komarenko, A.N. and Trotsenko, V.A. (1999) “Variational method for the solution of problems of transmission with the principal conjugation condition”, Ukrains’kyi Matematychnyi Zhurnal, 51(6), pp. 762–775. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4663 (Accessed: 14 April 2025).