EL-AHMADY, A. E. Limits of fuzzy retractions of fuzzy hyperspheres and their foldings. Tamkang Journal of Mathematics, [S. l.], v. 37, n. 1, p. 47–55, 2006. DOI: 10.5556/j.tkjm.37.2006.178. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/178. Acesso em: 5 may. 2024.