KomarenkоAN. Problem of eigenvalues with a parameter under boundary value conditions for elliptical equations degenerating on part of the region boundary . Ukr. Mat. Zhurn. [Internet]. 1966Oct.27 [cited 2024Jul.27];18(6):3-11. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/8455