TY  - JOUR
AU  - Goodman, A. W.
TI  - The Valence of Sums and Products
JO  - Canadian journal of mathematics
PY  - 1968
SP  - 1173
EP  - 1177
VL  - 20
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-111-0/
DO  - 10.4153/CJM-1968-111-0
ID  - 10_4153_CJM_1968_111_0
ER  -