@article{ADM_2009_1_a3,
     author = {Tim Boykett},
     title = {All difference family structures arise from groups},
     journal = {Algebra and discrete mathematics},
     pages = {20--31},
     year = {2009},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2009_1_a3/}
}