HAVLÍČEK, M.; POŠTA, S. The Diamond Lemma and the PBW Property in Quantum Algebras. Acta Polytechnica, Prague, Czech Republic, v. 50, n. 5, 2010. DOI: 10.14311/1263. Disponível em: https://ojs.cvut.cz/ojs/index.php/ap/article/view/1263. Acesso em: 2 apr. 2025.