K. KAMALA; V. SEENIVASAN. On upper and lower completely contra e-irresolute fuzzy multifunction. Malaya Journal of Matematik, India, v. 8, n. 03, p. 827–831, 2020. DOI: 10.26637/MJM0803/0016. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/1509. Acesso em: 16 jul. 2024.