@article{DMTCS_2008_special_255_a55,
     author = {Kwak, Jin Ho and Mednykh, Alexander and Nedela, Roman},
     title = {Enumeration of orientable coverings of a non-orientable manifold},
     journal = {Discrete mathematics & theoretical computer science},
     publisher = {mathdoc},
     volume = {DMTCS Proceedings vol. AJ, 20th Annual International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2008)},
     year = {2008},
     doi = {10.46298/dmtcs.3647},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.3647/}
}