TY  - JOUR
AU  - A. V. Shutov
TI  - The number of words of a~given length in the planar crystallographic groups
JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 2003
SP  - 188
EP  - 197
VL  - 302
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ZNSL_2003_302_a12/
LA  - ru
ID  - ZNSL_2003_302_a12
ER  -