1. Pesch, H.J., "Neighboring Optimum Guidance of a Space-Shuttle-Orbiter-Type Vehicle", J. Guidance and Control, Vol. 3, No. 5, 1980, pp. 386–391.
2. Bock, H.G. and Krämer-Eis, P., "A Multiple Shooting Method for Numerical Computation of Open and Closed Loop Controls in Nonlinear Systems", preprints of the 9th IFAC world congress, Vol. 9, Budapest, Hungary, July 1984, pp. 179–183.
3. Singular Perturbations in Systems and Control, CISM Courses and Lectures;M.D. Ardema,1983
4. Seywald, J., "Range Optimal Flight Paths for a Supersonic Aircraft", diploma thesis, Technical University of Munich, FRG, 1984 (in German).
5. Dickmanns, E.D., and Well, K.H., "Approximate Solution of Optimal Control Problems Using Third Order Hermite Polynomial Functions", Lecture Notes in Comp. Science, Vol. 27, 1975, pp. 158–166.