A description based on languages of the final non-deterministic automaton. - Adolfo Ballester-Bolinches; Enric Cosme-Llópez; Ramon Esteban-Romero (Theor. Comput. Sci., 2014)

Formations of Monoids, Congruences, and Formal Languages. - Adolfo Ballester-Bolinches; Enric Cosme-Llópez; Ramon Esteban-Romero; Jan J. M. M. Rutten (Sci. Ann. Comput. Sci., 2015)

Errata to "Formations of Monoids, Congruences, and Formal Languages". - Adolfo Ballester-Bolinches; Enric Cosme-Llópez; Ramon Esteban-Romero; Jan J. M. M. Rutten (Sci. Ann. Comput. Sci., 2016)

Enumeration of left braces with additive group 𝐶₄×𝐶₄×𝐶₄. - Adolfo Ballester-Bolinches; Ramon Esteban-Romero; V. Pérez-Calabuig (Math. Comput., 2023)