DINGGUO, W.; SHILIN, Y.; QINGZHONG, J. Categorical methods in Hopf algebras. Tamkang Journal of Mathematics, [S. l.], v. 32, n. 4, p. 281–292, 2001. DOI: 10.5556/j.tkjm.32.2001.343. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/343. Acesso em: 26 apr. 2024.