DR. A.R. MADHUSUDANA REDDY. The study of mathematical objects and structures that are countable or discrete.The study of mathematical objects and structures that are countable or discrete. African Diaspora Journal of Mathematics ISSN: 1539-854X, Multidisciplinary UGC CARE GROUP I, [S. l.], v. 22, n. 2, p. 13–22, 2023. Disponível em: https://newjournalzone.in/index.php/ijmfsmr/article/view/46. Acesso em: 24 nov. 2024.