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2. Leitmann, G., On a Coordinate Transformation and Its Application to the Direct Optimization of a Class of Integrals, Proceedings of the Symposium on Synergies in Engineering Research, University of Ulm, Ulm, Germany, pp. 3–8, 2000.
3. Leitmann, G., On Direct Extremization of a Class of Integrals, Proceedings of the International Workshop on Decision and Control in Management Science, University of Montreal, Montreal, Quebec, Canada, 2000; Kluwer Academic Publishers, Dordrecht, Holland (in press).
4. Bolza, O., Lectures on the Calculus of Variations, Stechert and Company, New York, NY, 1931.
5. Leitmann, G., The Calculus of Variations and Optimal Control, Plenum Publishing Company, New York, NY, 1981.