TY  - JOUR
AU  - A. A. Ardentov
TI  - Extremal paths in the nilpotent sub-Riemannian problem on the Engel group (subcritical case of pendulum oscillations)
JO  - Contemporary Mathematics. Fundamental Directions
PY  - 2011
SP  - 30
EP  - 35
VL  - 42
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMFD_2011_42_a3/
LA  - ru
ID  - CMFD_2011_42_a3
ER  -