TY  - JOUR
AU  - E. S. Lyapin
TI  - Defining relations of semigroups of all directed transformations of an~ordered finite set
JO  - Matematičeskie zametki
PY  - 1968
SP  - 657
EP  - 662
VL  - 3
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1968_3_6_a4/
LA  - ru
ID  - MZM_1968_3_6_a4
ER  -