TY  - JOUR
AU  - M. I. Kharitonov
TI  - The estimate of the number of permutationally-ordered sets
JO  - Vestnik Moskovskogo universiteta. Matematika, mehanika
PY  - 2015
SP  - 24
EP  - 28
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/VMUMM_2015_3_a4/
LA  - ru
ID  - VMUMM_2015_3_a4
ER  -