1. Exponential representation of flows and chronological calculus;Agrachev;Math. USSR Sb.,1978
2. Volterra series and substitution groups;Agrachev;Itogi Nauki, VINITI. Sovremennye Problemy Matematiki. Noveshie Dostijenia,1991
3. Local invariants of smooth control systems;Agrachev;Acta Appl. Math.,1989
4. A group-theoretic approach to discrete-time nonlinear controllability;Fliess,1981
5. Ordinary differential equations on vector bundles and chronological calculus;Gamkrelidze;Itogi Nauki, VINITI. Sovremennye Problemy Matematiki. Noveyshie Dostijenia,1989