A typical publish-or-perish publication: an elementary sophomore-level exercise in separable PDEs and WKB. MR2669574 Gu, Xiao-Yan; Zhang, Meng; Sun, Jian-Qiang Exact solutions of non-central potentials. Modern Phys. Lett. B 24 (2010), no. 16, 1759--1767. 81Q35