@article{10_37236_376,
     author = {Pingzhi Yuan and Xiangneng Zeng},
     title = {On zero-sum free subsets of length 7},
     journal = {The electronic journal of combinatorics},
     year = {2010},
     volume = {17},
     doi = {10.37236/376},
     zbl = {1231.05295},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/376/}
}