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.