Liu, Yuji. “Solvability of Boundary Value Problems for Singular Quasi-Laplacian Differential Equations on the Whole Line”. Mathematical Modelling and Analysis 17, no. 3 (June 1, 2012): 423-446. Accessed November 25, 2024. https://jcem.vgtu.lt/index.php/MMA/article/view/4882.