TY  - JOUR
AU  - Mati Kilp
TI  - Commutative monoids all of whose principal ideals are projective.
JO  - Semigroup forum
PY  - 1974
SP  - 334
EP  - 339
VL  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1974__6_133991/
ID  - SF_1974__6_133991
ER  -