Weaver, Harold A. (1981). Ultraviolet spectra of comets observed with the International Ultraviolet Explorer satellite observatory (PhD). Johns Hopkins University. Bibcode:1981PhDT........53W. OCLC10543591.
Weaver, Harold A. (1981). Ultraviolet spectra of comets observed with the International Ultraviolet Explorer satellite observatory (PhD). Johns Hopkins University. Bibcode:1981PhDT........53W. OCLC10543591.