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@article{AM_1999_150_3_a4, author = {Neil Robertson and P.D. Seymour and Robin Thomas}, title = {Permanents, {Pfaffian} orientations, and even directed circuits}, journal = {Annals of mathematics}, publisher = {mathdoc}, volume = {150}, number = {3}, year = {1999}, url = {http://geodesic.mathdoc.fr/item/AM_1999_150_3_a4/} }
Neil Robertson; P.D. Seymour; Robin Thomas. Permanents, Pfaffian orientations, and even directed circuits. Annals of mathematics, Tome 150 (1999) no. 3. http://geodesic.mathdoc.fr/item/AM_1999_150_3_a4/