Mahmoodi, Akram, Maryam Atapour, and Sepideh Norouzian. “On the Signed Strong Total Roman Domination Number of Graphs”. Tamkang Journal of Mathematics 54, no. 3 (July 29, 2022): 265–280. Accessed May 18, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/3907.