Nitin J. Wange, and M. N. Gaikwad. “Analytical Solution of the Problem on the Three-Dimensional Transient Heat Conduction in a Multilayer Rectangular Region”. International Journal of Mathematics And Its Applications, vol. 5, no. 2 - C, June 2017, pp. 383-90, https://ijmaa.in/index.php/ijmaa/article/view/832.