Podlevs’kyi, B. M. (2009) “Variational approach to the solution of linear multiparameter eigenvalue problems”, Ukrains’kyi Matematychnyi Zhurnal, 61(9), pp. 1247-1256. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3096 (Accessed: 18April2024).