1. A New Transformation Invariant in the Orbital Boundary-Value Problem
2. Lambert's Problem Revisited
3. (51Battin, R.H., A New Solution for Lambert's Problem, Proceedings of the XIX International Astronautical Congress, International Academy of Astronautics, Vol.2, Astrodynamics and Astrionics, Pergamon Press, New York, 1970, pp.131-150.