COŞKUN, Haskiz; KABATAŞ, Ayşe. Asymptotic Approximations of Eigen-Functions for Regular Sturm-Liouville Problems with Eigenvalue Parameter in the Boundary Condition for Integrable Potential. Mathematica Scandinavica, Berkeley, CA, United States, v. 113, n. 1, p. 143–160, 2013. DOI: 10.7146/math.scand.a-15486. Disponível em: https://journals.msp.org/mscand/article/view/442. Acesso em: 24 jul. 2026.