TY  - JOUR
AU  - F. Otto
TI  - On two problems related to cancellativity.
JO  - Semigroup forum
PY  - 1986
SP  - 331
EP  - 356
VL  - 33
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1986__33_134818/
ID  - SF_1986__33_134818
ER  -