TY  - JOUR
AU  - Burshtein, Nechemia
AU  - Schönheim, Johanan
TI  - On exactly covering systems of congruences having moduli occurring at most twice
JO  - Czechoslovak Mathematical Journal
PY  - 1974
SP  - 369
EP  - 372
VL  - 24
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1974.101250/
DO  - 10.21136/CMJ.1974.101250
LA  - en
ID  - 10_21136_CMJ_1974_101250
ER  -