TY  - JOUR
AU  - M. Gould
TI  - An easy proof of Ponizovski's theorem.
JO  - Semigroup forum
PY  - 1977
SP  - 181
EP  - 182
VL  - 15
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1977__15_134248/
ID  - SF_1977__15_134248
ER  -