DhaliwalR.S., RokneJ., and SinghB. M. 2010. “On Closed-Form Solutions of Triple Series Equations Involving Laguerre Polynomials”. Ukrains’kyi Matematychnyi Zhurnal 62 (2), 231 -. https://umj.imath.kiev.ua/index.php/umj/article/view/2859.