1. Short round trip opportunities to asteroid 1982 DB during the close approach in 2001–2002;Freidlander;SAI Memo to Rick Pomphrey,1982
2. Discovering an asteroid;Helin;Planet. Rep.,1982
3. Accessible Earth-crossing asteroids;Helin;Bull. Amer. Astron. Soc.,1982
4. Palomar planet-crossing asteroid survey, 1973–1978;Helin;Icarus,1979
5. Optimum two-impulse transfers for preliminary interplanetary trajectory design;Hulkower;Journal of Guidance, Control and Dynamics,1984