@article{10_4064_cm6702_1_2016,
     author = {Xiangneng Zeng and Xiaoxia Qi},
     title = {On minimal zero-sum sequences of length four over cyclic groups},
     journal = {Colloquium Mathematicum},
     pages = {157--163},
     publisher = {mathdoc},
     volume = {146},
     number = {2},
     year = {2017},
     doi = {10.4064/cm6702-1-2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm6702-1-2016/}
}