@article{10_4064_cm135_2_4,
     author = {Caixia Shen and Li-meng Xia and Yuanlin Li},
     title = {On the index of length four minimal
 zero-sum sequences},
     journal = {Colloquium Mathematicum},
     pages = {201--209},
     publisher = {mathdoc},
     volume = {135},
     number = {2},
     year = {2014},
     doi = {10.4064/cm135-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm135-2-4/}
}