@article{10_37236_1698,
     author = {Rui Xu and Cun-Quan Zhang},
     title = {Nowhere-zero 3-flows in squares of graphs},
     journal = {The electronic journal of combinatorics},
     year = {2003},
     volume = {10},
     doi = {10.37236/1698},
     zbl = {1018.05031},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1698/}
}