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@article{AM2_1981__23_136912, author = {Kai Wang}, title = {A generalization of group difference sets and the matrix equation {Am} = {dI} + {...J.}}, journal = {Aequationes mathematicae}, pages = {212--222}, publisher = {mathdoc}, volume = {23}, year = {1981}, zbl = {0504.05018}, url = {http://geodesic.mathdoc.fr/item/AM2_1981__23_136912/} }
Kai Wang. A generalization of group difference sets and the matrix equation Am = dI + ...J.. Aequationes mathematicae, Tome 23 (1981), pp. 212-222. http://geodesic.mathdoc.fr/item/AM2_1981__23_136912/