1. Methane on Triton and Pluto: New CCD spectra;Apt;Astrophys. J.,1983
2. Reflection Spectra of Pluto and Three Distant Satellites;Bell;Bull. Amer. Astro. Soc.,1979
3. The Visual and Near Infrared Spectrum of Methane and its Application to Uranus, Neptune, Triton, and Pluto;Benner,1979
4. Ultraviolet spectrometer observations of Neptune and Triton;Broadfoot;Science,1989
5. Lightcurve CCD Spectrophotometry of Pluto;Buie,1984