Permanents, Pfaffian orientations, and even directed circuits.
Robertson, Neil ; Seymour, P.D. ; Thomas, Robin
Annals of Mathematics. Second Series, Tome 150 (1999), p. 929-975 / Harvested from The Electronic Library of Mathematics
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Publié le : 1999-01-01
DOI : https://doi.org/10.2307/121059
EUDML-ID : urn:eudml:doc:120561 
@article{01423418,
     title = {Permanents, Pfaffian orientations, and even directed circuits.},
     journal = {Annals of Mathematics. Second Series},
     volume = {150},
     year = {1999},
     pages = {929-975},
     doi = {10.2307/121059},
     zbl = {0947.05066},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01423418}
}

Robertson, Neil; Seymour, P.D.; Thomas, Robin. Permanents, Pfaffian orientations, and even directed circuits.. Annals of Mathematics. Second Series, Tome 150 (1999) pp. 929-975. doi : 10.2307/121059. http://gdmltest.u-ga.fr/item/01423418/