1. Marchio', C.,Complete (M, N, F)-Controllability, Revue Roumaine de Mathématiques Pures et Appliquées, Vol. 24, pp. 273?280, 1979.
2. Boltyanskii, V. G.,Mathematical Methods of Optimal Control, Holt, Rinehart, and Winston, New York, New York, 1971.
3. Nistri, P.,Remarks on a Theorem of Fel'dbaum, Bollettino della Unione Mathematica Italiana, Vol. 11, Supplement to No. 3, pp. 554?564, 1975.
4. Sussmann, H. J.,A Bang-Bang Theorem with Bounds on the Number of Switchings, SIAM Journal on Control and Optimization, Vol. 17, pp. 629?651, 1979.
5. Conti, R.,Linear Differential Equations and Control, Academic Press, London, England, 1976.