The authors return, once more, to the Rodrigues formula in its
form and application presented in a chapter of the Nikiforov's and
Uvarov's 1998 monograph on special functions. The present
paedagogically appealing paper shows that and how this approach
enables one to solve the one-dimensional Klein-Gordon equation
with a PT-symmetric version of Hulthen potential.

MR2316227 Egrifes, Harun; Sever, Ramazan Bound-state solutions
of the Klein-Gordon equation for the generalized $PT$-symmetric
Hulthén potential.
Internat. J. Theoret. Phys. 46 (2007), no. 4, 935--950.
81Qxx