Title:  Differential geometric and group theoretic methods in optimal control theory 
 Authors:  A. A. Agrachev, S. A. Vakhrameev, R. V. Gamkrelidze 
 Journal title:  J. Soviet Math. 
 Year:  1985 
 Volume:  28 
 Pages:  145-182 
 Citation:  
A. A. Agrachev, S. A. Vakhrameev, R. V. Gamkrelidze, “Differential geometric and group theoretic methods in optimal control theory”, Journal of Soviet Mathematics, 1985, 28:2, 145–182
 MathNet (ENG):  
					http://mi.mathnet.ru/eng/intg136

