SunH.-J. (2011) “Estimates for weighted eigenvalues of fourth-order elliptic operator with variable coefficients”, Ukrains’kyi Matematychnyi Zhurnal, 63(7), pp. 999-1008. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2780 (Accessed: 23November2024).