@article{10_37236_4038,
     author = {Shude Long and Han Ren},
     title = {Counting 2-connected 4-regular maps on the projective plane},
     journal = {The electronic journal of combinatorics},
     year = {2014},
     volume = {21},
     number = {2},
     doi = {10.37236/4038},
     zbl = {1300.05131},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/4038/}
}