KomarovG. N. “Spectral Problems With Boundary and Conjugating Conditions Depending on a Parameter”. Ukrains’kyi Matematychnyi Zhurnal 47, no. 12 (December 25, 1995): 1653–1660. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5558.