@article{10_4064_aa_28_2_147_156,
     author = {John Olson},
     title = {Sums of sets of group elements},
     journal = {Acta Arithmetica},
     pages = {147--156},
     publisher = {mathdoc},
     volume = {28},
     number = {2},
     year = {1975},
     doi = {10.4064/aa-28-2-147-156},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-28-2-147-156/}
}