@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/