@article{05132838, title = {A characterization for sparse }, journal = {The Electronic Journal of Combinatorics [electronic only]}, volume = {14}, year = {2007}, zbl = {1112.05089}, language = {en}, url = {http://dml.mathdoc.fr/item/05132838} }
Gerke, Stefanie; Steger, Angelika. A characterization for sparse . The Electronic Journal of Combinatorics [electronic only], Tome 14 (2007) . http://gdmltest.u-ga.fr/item/05132838/