TY  - JOUR
AU  - N. Hindman
TI  - Sums equal to products in ßN.
JO  - Semigroup forum
PY  - 1980
SP  - 221
EP  - 256
VL  - 21
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1980__21_134450/
ID  - SF_1980__21_134450
ER  -