PRASAD, Bidyanand. Category of Fuzzy Sets. Academic Voices: A Multidisciplinary Journal, [S. l.], v. 1, p. 13–15, 2011. DOI: 10.3126/av.v1i0.5301. Disponível em: https://www.nepjol.info/index.php/AV/article/view/5301. Acesso em: 6 dec. 2025.