@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/