@article{05348111, title = {Unmixed bipartite graphs.}, journal = {Revista Colombiana de Matem\'aticas}, volume = {41}, year = {2007}, pages = {393-395}, zbl = {1171.05405}, language = {en}, url = {http://dml.mathdoc.fr/item/05348111} }
Villarreal, Rafael H. Unmixed bipartite graphs.. Revista Colombiana de Matemáticas, Tome 41 (2007) pp. 393-395. http://gdmltest.u-ga.fr/item/05348111/