Edelbaum, T. N., "Propulsion Requirements for Controllable Satellites," ARSJ, Aug. 1961, pp. 1079-89.

Broucke, R. A., and Cefola, P. J., "On the Equinoctial Orbit Elements," Celestial Mechanics 5, pp. 303-310, 1972.

Herrick, S., Astrodynamics, Vol. II, Van Nostrand Reinhold, London, 1972.

Plummer, H. C., An Introductory Treatise on Dynamical Astronomy, Dover, New York, 1960.

Cefola, P. J., "Equinoctial Orbit Elements: Application to Artificial Satellite Orbits," AIAA Paper 72-937, AIAA/AAS Astrodynamics Conference, Palo Alto, CA, Sept. 11-12, 1972.

Edelbaum, T. N., Sackett, L. L., and Malchow, H. L., "Optimal Low Thrust Geocentric Transfer," AIAA Paper 73-1074, AIAA 10th Electric Propulsion Conference, Lake Tahoe, NV, Oct. 31-Nov. 2, 1973.

Cefola, P. J., Long, A. C., and Holloway, G., Jr., "The Long-Term Prediction of Artificial Satellite Orbits," AIAA Paper 74-170, AIAA 12th Aerospace Sciences Meeting, Washington, DC, Jan. 30-Feb. 1, 1974.

Sackett, L. L., and Edelbaum, T. N., "Effect of Attitude Constraints on Solar-Electric Geocentric Transfers," AIAA Paper 75-350, AIAA 11th Electric Propulsion Conference, New Orleans, LA, March 19-21, 1975.

Kechichian, J. A., "Equinoctial Orbit Elements: Application to Optimal Transfer Problems," AIAA Paper 90-2976, AIAA/AAS Astrodynamics Conference, Portland, OR, Aug. 20-22, 1990.

Kechichian, J. A., "Trajectory Optimization with a Modified Set of Equinoctial Orbit Elements," AAS/AIAA Paper 91-524, Astrodynamics Specialist Conference, Durango, CO, Aug. 19-22, 1991.

Bryson, A. E., and Ho, Y-C., Applied Optimal Control, Ginn, Waltham, MA, 1969.

Marec, J-P., Optimal Space Trajectories, Elsevier, Amsterdam, 1979.

Vinh, N. X., Optimal Trajectories in Atmospheric Flight,...