TY  - JOUR
AU  - D.V. Dekov
TI  - HNN extensions of semigroups.
JO  - Semigroup forum
PY  - 1994
SP  - 83
EP  - 88
VL  - 49
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1994__49_2_135336/
ID  - SF_1994__49_2_135336
ER  -