D. Piriadarshani, et al. “LAMBERTS W FUNCTION APPROACH ONTHE STABILITY ANALYSIS OF ONE DIMENSIONAL WAVE EQUATION VIA SECOND ORDER NEUTRAL DELAY DIFFERENTIAL EQUATION”. PalArch’s Journal of Archaeology of Egypt Egyptology, vol. 17, no. 7, Nov. 2020, pp. 4781-90, https://www.archives.palarch.nl/index.php/jae/article/view/2596.