1. Methods of Mathematical Physics;Courant,1953
2. The Variational Principles of Mechanics;Lanczos,1957
3. Quasilinearization and Nonlinear Boundary Value Problems;Bellman,1965
4. P. G. KIRMSER, Invariant Imbedding Applied to the Calculation of Beam Deflections, undated Kansas State University report.
5. Dynamic Programming and Modern Control Theory;Bellman,1966