1.
Aliev BA, Kurbanova NK, Yakubov Y. On one boundary-value problem for elliptic differential-operator equations of the second order with quadratic spectral parameter. Ukr. Mat. Zhurn. [Internet]. 2017Jun.25 [cited 2020Nov.29];69(6):734-50. Available from: http://umj.imath.kiev.ua/index.php/umj/article/view/1732