Varghese, Eddith Sarah, D. Antony Xavier, Deepa Mathew, and S. Arul Amirtha Raja. “Strong Open Monophonic Number of a Graph”. Communications in Mathematics and Applications 12, no. 3 (September 30, 2021): 509–518. Accessed May 4, 2024. https://www.rgnpublications.com/journals/index.php/cma/article/view/1531.