TY  - JOUR
AU  - Johnsen, E. C.
TI  - Special Abelian Group Difference Sets
JO  - Canadian journal of mathematics
PY  - 1968
SP  - 1269
EP  - 1275
VL  - 20
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-124-2/
DO  - 10.4153/CJM-1968-124-2
ID  - 10_4153_CJM_1968_124_2
ER  -