On the center of the fundamental group of the complement of a hyperplane arrangement. Cordovil, Raul — 1994 Portugaliae Mathematica
An Orlik-Solomon type algebra for matroids with a fixed linear class of circuits. Cordovil, Raul; Forge, David — 2006 Portugaliae Mathematica. Nova Série
An elementary chromatic reduction for gain graphs and special hyperplane arrangements. Berthomé, Pascal; Cordovil, Raul; Forge, David; Ventos, Véronique; Zaslavsky, Thomas — 2009 The Electronic Journal of Combinatorics [electronic only]
Parallel projection of matroid spheres Cordovil, Raúl; Guedes de Oliveira, A.; Moreira, M. Leonor — 1988 Portugaliae mathematica
On the notion of transversal of a sum of matroids Cordovil, Raúl; Dias da Silva, J.A.; Fonseca, Amélia — 1988 Portugaliae mathematica