FUJITA, Takaaki. Contra-HyperSoft Set and Contra-SuperHyperSoft Set. HyperSoft Set Methods in Engineering, [S. l.], v. 5, p. 1–14, 2026. DOI: 10.61356/j.hsse.2026.5637. Disponível em: https://ojs.sciencesforce.com/index.php/hsse/article/view/637.. Acesso em: 25 oct. 2026.