1. Gradient Theory of Optimal Flight Path;KELLEY;ARS J.,1960
2. A. BRYSON, W. DENHAM, E. CARROLL, and K. MIKAMI, Determination of the Lift or Drag Program That Minimizes Reentry Heating with Acceleration Constraints, IAS Paper No. 61–6 (1961).
3. Über eine Neue Methode zur Lösung gewisser Variationsprobleme der Mathematischen Physik;RITZ;J. Reine Angew. Math,1908
4. Computational Techniques for Chemical Engineers;ROSENBROCK,1966
5. Use of Polynomial Approximations to Calculate Suboptimal Controls;WILLIAMSON;J. Am. Inst. Aer. Astron.,1971