Stephen John, B. “VERTEX COVER POLYNOMIAL OF SEA URCHIN GRAPH AND LOLLY POP GRAPH”. Journal of Global Research in Mathematical Archives(JGRMA) 4, no. 12 (December 15, 2017): 40–46. Accessed April 19, 2026. https://mail.jgrma.com/index.php/jgrma/article/view/384.