ALTENKIRCH, T.; CHAPMAN, J.; UUSTALU, T. Relative Monads Formalised. Journal of Formalized Reasoning, [S. l.], v. 7, n. 1, p. 1–43, 2014. DOI: 10.6092/issn.1972-5787/4389. Disponível em: https://jfr.unibo.it/article/view/4389. Acesso em: 23 sep. 2021.