Words avoiding a reflexive acyclic relation.
Dollhopf, John ; Goulden, Ian ; Greene, Curtis
The Electronic Journal of Combinatorics [electronic only], Tome 13 (2006), / Harvested from The Electronic Library of Mathematics
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Publié le : 2006-01-01
EUDML-ID : urn:eudml:doc:125511 
@article{05005209,
     title = {Words avoiding a reflexive acyclic relation.},
     journal = {The Electronic Journal of Combinatorics [electronic only]},
     volume = {13},
     year = {2006},
     zbl = {1080.05003},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05005209}
}

Dollhopf, John; Goulden, Ian; Greene, Curtis. Words avoiding a reflexive acyclic relation.. The Electronic Journal of Combinatorics [electronic only], Tome 13 (2006) . http://gdmltest.u-ga.fr/item/05005209/