Lopez Molina, J. A. “Existence and Uniqueness of Solutions of Robin’s Problem for the Anisotropic Hyperbolic Heat Equation With Non Regular Data”. Journal of Progressive Research in Mathematics, Vol. 13, no. 1, Feb. 2018, pp. 2196-03, http://scitecresearch.com/journals/index.php/jprm/article/view/1411.