@article{10_37236_1961,
     author = {Sven Hartmann and C.H.C. Little},
     title = {Even bonds of prescribed directed parity},
     journal = {The electronic journal of combinatorics},
     year = {2005},
     volume = {12},
     doi = {10.37236/1961},
     zbl = {1079.05084},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1961/}
}