On (r,g,χ)- graphs and cages of regularity r, girth g and chromatic number χ. - Gabriela Araujo-Pardo; Julio César Díaz-Calderón; Julián Fresán-Figueroa; Diego González-Moreno; Linda M. Lesniak; Mika Olsen (Art Discret. Appl. Math., 2025)