@article{00920899, title = {On alternating products of graph relations.}, journal = {S\'eminaire Lotharingien de Combinatoire [electronic only]}, volume = {33}, year = {1994}, zbl = {0855.05093}, language = {en}, url = {http://dml.mathdoc.fr/item/00920899} }
Bodendiek, R.; Lang, R. On alternating products of graph relations.. Séminaire Lotharingien de Combinatoire [electronic only], Tome 33 (1994) . http://gdmltest.u-ga.fr/item/00920899/