@article{10_37236_1772,
     author = {Daniel Kr\'al},
     title = {On feasible sets of mixed hypergraphs},
     journal = {The electronic journal of combinatorics},
     year = {2004},
     volume = {11},
     number = {1},
     doi = {10.37236/1772},
     zbl = {1055.05058},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1772/}
}