TY  - JOUR
AU  - A. Umar
TI  - Some combinatorial problems in the theory of symmetric inverse semigroups
JO  - Algebra and discrete mathematics
PY  - 2010
SP  - 115
EP  - 126
VL  - 9
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ADM_2010_9_2_a8/
LA  - en
ID  - ADM_2010_9_2_a8
ER  -