TY  - JOUR
AU  - Hall, Robert E.
TI  - Commutative cancellative semigroups with two generators
JO  - Czechoslovak Mathematical Journal
PY  - 1971
SP  - 449
EP  - 452
VL  - 21
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1971.101046/
DO  - 10.21136/CMJ.1971.101046
LA  - en
ID  - 10_21136_CMJ_1971_101046
ER  -