1. Allen, C. W., , Astrophysical Quantities, Athlone, London, 1963,
2. Infra-red photometry of Saturn, Titan and the rings;Allen;Icarus,1971
3. The reflectivity of Titan from 3000-4350Å;Barker;Bull. Amer. Astron. Soc.,1973
4. Photoelectric observations of Saturn satellites Rhea and Titan;Blanco;Astron. Astrophys.,1971
5. The continuum albedo of Titan;Caldwell;Bull. Amer. Astron. Soc.,1973