A.A. Agrachev, A.V. Sarychev, Filtrations of a Lie algebra of vector fields and nilpotent approximation of controlled systems

Title: Filtrations of a Lie algebra of vector fields and nilpotent approximation of controlled systems
Authors: A.A. Agrachev, A.V. Sarychev
Journal title: Dokl. Acad. Nauk SSSR
Year: 1987
Issue: 4
Volume: 295
Pages: 777-781