1. CLOHESSY, W. H. “Terminal Guidance System for Satellite Rendezvous,” Journal of Aerospace Sciences, Vol. 27, September 1960, pp. 653–658, 674.
2. VADDI, S. S., VADALI, S. R., and ALFRIEND, K. T. “Formation Flying: Accommodating Nonlinearity and Eccentricity Perturbations,” presented as paper AAS 02–184 at the AAS/AIAA Space Flight Mechanics Meeting, San Antonio, Texas, January 27–30, 2002.
3. SCHAUB, H. and ALFRIEND, K. T. “J2 Invariant Relative Orbits for Formation Flying,” International Journal of Celestial Mechanics and Dynamical Astronomy, Vol. 79, 2001, pp. 77–95.
4. VADALI, S. R., VADDI, S. S., and ALFRIEND, K. T. “A New Concept for Controlling Formation Flying Satellite Constellations,” presented as paper AAS 01–218 at the AAS/AIAA Space Flight Mechanics Meeting, Santa Barbara, California, February 11–15, 2001.
5. GIM, D.-W. and ALFRIEND, K. T. “The State Transition Matrix of Relative Motion for the Perturbed Non-Circular Reference Orbit,” presented as paper AAS 01–222 at the AAS/AIAA Space Flight Mechanics Meeting, Santa Barbara, California, February 11–15, 2001.