Characterizing and Edge-colouring Split-indifference Graphs. - Carmen Ortiz; Nelson Maculan; Jayme Luiz Szwarcfiter (Discret. Appl. Math., 1998)

Edge Colouring Reduced Indifference Graphs. - Celina M. H. de Figueiredo; Célia Picinin de Mello; Carmen Ortiz (LATIN, 2000)

Decompositions for the edge colouring of reduced indifference graphs. - Celina M. H. de Figueiredo; João Meidanis; Célia Picinin de Mello; Carmen Ortiz (Theor. Comput. Sci., 2003)

Difficult Problems in Threshold Graphs. - Carmen Ortiz; Mónica Villanueva-Ilufi (Electron. Notes Discret. Math., 2004)

Maximal independent sets in caterpillar graphs. - Carmen Ortiz; Mónica Villanueva (Discret. Appl. Math., 2012)

Maximal independent sets in grid graphs. - Carmen Ortiz; Mónica Villanueva (Int. Trans. Oper. Res., 2017)