1. astrodynamicist and friend;Van der Ha;Acta Astronautica,1993
2. John Breakwell: the restricted problem and halo orbits;Howell;Acta Astronautica,1993
3. The optimization of trajectories;Breakwell;J. Soc. Indust. appl. Math.,1959
4. The optimum spacing of corrective thrusts in interplanetary navigation;Breakwell,1961
5. Researches in interplanetary transfer;Breakwell;J. Am. Rocket Soc.,1961