TY  - JOUR
AU  - D. Z. Kagan
TI  - Invariant functions on free groups and special HNN-extensions
JO  - Čebyševskij sbornik
PY  - 2017
SP  - 109
EP  - 122
VL  - 18
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CHEB_2017_18_1_a6/
LA  - ru
ID  - CHEB_2017_18_1_a6
ER  -