Zheng, Jiajia, Kun Li, and Zhaowen Zheng. “Eigenvalues of Sturm-Liouville Problems With Eigenparameter Dependent Boundary and Interface Conditions”. Mathematical Modelling and Analysis 28, no. 3 (September 4, 2023): 374–392. Accessed November 22, 2024. https://jest.vgtu.lt/index.php/MMA/article/view/17094.