TY  - JOUR
AU  - R. Simpson
AU  - Doron Zeilberger
TI  - Necessary conditions for distinct covering systems with square-free moduli
JO  - Acta Arithmetica
PY  - 1991
SP  - 59
EP  - 70
VL  - 59
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/aa-59-1-59-70/
DO  - 10.4064/aa-59-1-59-70
LA  - en
ID  - 10_4064_aa_59_1_59_70
ER  -