M. I. Qureshi, Deepak Kumar Kabra, and Naseem Ahmad Khan. “Some Generating Relations Involving Laguerre Polynomials of Several Variables”. International Journal of Mathematics And Its Applications, vol. 3, no. 3 - C, Oct. 2015, pp. 13-18, http://ijmaa.in/index.php/ijmaa/article/view/462.