FUJITA, Takaaki. PolyTree-Soft Sets and PolyForest-Soft Sets: A Directed Acyclic Framework for Soft Set Modeling. HyperSoft Set Methods in Engineering, [S. l.], v. 4, p. 11–23, 2025. DOI: 10.61356/j.hsse.2025.4577. Disponível em: https://ojs.sciencesforce.com/index.php/hsse/article/view/577.. Acesso em: 25 oct. 2026.