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]