Smarandache, Florentin. “New Types of Soft Sets” HyperSoft Set, IndetermSoft Set, IndetermHyperSoft Set, and TreeSoft Set”: An Improved Version”. Neutrosophic Systems with Applications 8 (August 6, 2023): 35–41. Accessed November 20, 2024. https://sciencesforce.com/index.php/nswa/article/view/149.