1. The control and use of libration-point satellites;Farquhar;NASA TR R-346,1970
2. The utilization of halo orbits in advanced lunar operations;Farquhar;NASA TN D-6365,1971
3. SOHO—A cooperative scientific mission to the sun;Lo Galbo;ESA Bulletin,1992
4. Station keeping for a translunar communication station;Breakwell;Celestial Mechanics,1974
5. Nonlinear regulation in Halo orbits control design;Di Giamberardino,1992