Coskun, Haskiz, and Elif Baskaya. “Asymptotics of Eigenvalues of Regular Sturm-Liouville Problems With Eigenvalue Parameter in the Boundary Condition for Integrable Potential”. MATHEMATICA SCANDINAVICA 107, no. 2 (December 1, 2010): 209–223. Accessed November 23, 2024. https://www.mscand.dk/article/view/15152.