JOHN C., B. Hoàng Xuân Sính’s thesis: Categorifying Group Theory. Thang Long Journal of Science: Mathematics and Mathematical Sciences, [S. l.], v. 2, n. 8, 2023. Disponível em: https://science.thanglong.edu.vn/index.php/volc/article/view/112. Acesso em: 3 mar. 2024.