@article{10_37236_313,
     author = {Yan-Quan Feng and Jin-Ho Kwak and Jin-Xin Zhou},
     title = {Congruence classes of orientable 2-cell embeddings of bouquets of circles and dipoles},
     journal = {The electronic journal of combinatorics},
     year = {2010},
     volume = {17},
     doi = {10.37236/313},
     zbl = {1215.05041},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/313/}
}