TY  - JOUR
AU  - D. S. Malyshev
TI  - On intersection and symmetric difference of families of boundary classes in the problems on colouring and on the chromatic number
JO  - Diskretnaya Matematika
PY  - 2012
SP  - 75
EP  - 78
VL  - 24
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DM_2012_24_2_a5/
LA  - ru
ID  - DM_2012_24_2_a5
ER  -