@article{10_37236_1063,
     author = {Christopher R. H. Hanusa},
     title = {A {Gessel--Viennot-type} method for cycle systems in a directed graph},
     journal = {The electronic journal of combinatorics},
     year = {2006},
     volume = {13},
     doi = {10.37236/1063},
     zbl = {1100.05050},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1063/}
}