@article{GDZPPN002033526,
title = {A generalization of group difference sets and the matrix equation Am = dI + ...J.},
journal = {Aequationes mathematicae},
volume = {22},
year = {1981},
pages = {212-222},
zbl = {0504.05018},
url = {http://dml.mathdoc.fr/item/GDZPPN002033526}
}
Wang, Kai. A generalization of group difference sets and the matrix equation Am = dI + ...J.. Aequationes mathematicae, Tome 22 (1981) pp. 212-222. http://gdmltest.u-ga.fr/item/GDZPPN002033526/