1. Station keeping in the vicinity of collinear libration points with an application to a linear communications problem;Farquhar,1966
2. The control and use of libration point satellites;Farquhar;NASA TR R-346,1970
3. The first libration point satellite. Mission overview and flight history;Farquhar,1979
4. Station keeping for a translunar communication station;Breakwell;Cel. Mech.,1974
5. Station keeping of libration point orbits;Gomez;Final report ESOC contract 5648/83,1985