1. The Mars 1964–1965 apparition;Capen;Jet Propulsion Lab., Calif. Inst. Technol., Tech. Rept.,1966
2. Observations of Mars made in 1961 at the Pic du Midi observatory;Focas;Jet Propulsion Lab., Calif. Inst. Technol., Tech. Rept.,1962
3. The magnitude and color of Mars during the 1954 opposition;Johnson;Publ. Astron. Soc. Pacific,1955
4. The atmosphere of Mars;Menzel,1962
5. The opposition effect of Mars;O'Leary;Astrophys. J. Letters,1967