%0 Journal Article %A Padraig Ó Catháin %T Inequivalence of difference sets: on a remark of Baumert %J The electronic journal of combinatorics %D 2013 %V 20 %N 1 %U http://geodesic.mathdoc.fr/articles/10.37236/2277/ %R 10.37236/2277 %F 10_37236_2277