TY  - JOUR
AU  - Thomassen, Carsten
TI  - The even cycle problem for directed graphs
JO  - Journal of the American Mathematical Society
PY  - 1992
SP  - 217
EP  - 229
VL  - 05
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1992-1135027-1/
DO  - 10.1090/S0894-0347-1992-1135027-1
ID  - 10_1090_S0894_0347_1992_1135027_1
ER  -