TY  - JOUR
AU  - Z. Hedrlin
AU  - J. Kastl
TI  - On extensions onto sub-semigroups of semigroups with two generators.
JO  - Semigroup forum
PY  - 1971
SP  - 86
EP  - 88
VL  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1971__3_133850/
ID  - SF_1971__3_133850
ER  -