1. Bertsekas, D.P., Constrained Optimization and Lagrange Multiplier Methods, Academic Press, New York, 1982.
2. Hestenes, M.R., Calculus of Variations and Optimal Control Theory, Wiley, New York, 1966.
3. Cesari, L., Optimization — Theory and Applications, Springer, New York, 1983.
4. Childs, B., Scott, M., Daniel, J.W., Denman, E., Nelson, P. (eds.), Codes for Boundary-Value Problems in Ordinary Differential Equations, Springer, Berlin, 1979.
5. Bryson, A.E., Ho, Y.C., Applied Optimal Control, Ginn & Company, Waltham, 1969.