A.A. Agrachëv, A.V. Sarychev, Filtrations of a Lie algebra of vector fields and the nilpotent approximation of controllable systems

Title: Filtrations of a Lie algebra of vector fields and the nilpotent approximation of controllable systems
Authors: A.A. Agrachëv, A.V. Sarychev
Journal title: Soviet Math. Dokl.
Year: 1988
Issue: 1
Volume: 36
Pages: 104–108