Cedó, F., Jespers, E., & Klein, G. (2012). Finitely Presented Monoids and Algebras defined by Permutation Relations of Abelian Type. Journal of Pure and Applied Algebra, 216, 1033-1039. doi:10.1016/j.jpaa.2011.10.021 https://hdl.handle.net/2268/99630
Cedó, F., Jespers, E., & Klein, G. (2012). Finitely Presented Monoids and Algebras defined by Permutation Relations of Abelian Type. Journal of Pure and Applied Algebra, 216, 1033-1039. doi:10.1016/j.jpaa.2011.10.021