@article{1256059300, author = {Turyn, Richard}, title = {The nonexistence of seven difference sets}, journal = {Illinois J. Math.}, volume = {9}, number = {4}, year = {1965}, pages = { 590-594}, language = {en}, url = {http://dml.mathdoc.fr/item/1256059300} }
Turyn, Richard. The nonexistence of seven difference sets. Illinois J. Math., Tome 9 (1965) no. 4, pp. 590-594. http://gdmltest.u-ga.fr/item/1256059300/