@article{02038337,
title = {Matrix-free proof of a regularity characterization.},
journal = {The Electronic Journal of Combinatorics [electronic only]},
volume = {9},
year = {2003},
zbl = {1031.05070},
language = {en},
url = {http://dml.mathdoc.fr/item/02038337}
}
Czygrinow, A.; Nagle, B. Matrix-free proof of a regularity characterization.. The Electronic Journal of Combinatorics [electronic only], Tome 9 (2003) . http://gdmltest.u-ga.fr/item/02038337/