@article{10_37236_1538,
     author = {Andr\'e K\"undgen and Eric Mendelsohn and Vitaly Voloshin},
     title = {Colouring planar mixed hypergraphs},
     journal = {The electronic journal of combinatorics},
     year = {2000},
     volume = {7},
     doi = {10.37236/1538},
     zbl = {0978.05027},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1538/}
}