Takaaki Fujita, Florentin Smarandache. An Introduction to Advanced Soft Set Variants: SuperHyperSoft Sets, IndetermSuperHyperSoft Sets, IndetermTreeSoft Sets, BiHyperSoft sets, GraphicSoft sets, and Beyond. Neutrosophic Sets Syst. 2025;82:817-843. Accessed May 19, 2025. https://fs.unm.edu/nss8/index.php/111/article/view/6062