MigeotteM.NevenL.SwenssonJ., “The Solar Spectrum from 2.8 to 23.7 Microns Part I. Photometric Atlas; Part II. Measures and Identifications,” University of Liege, Contract AF 61(514)-432 Phase A, Part I (1956), Part II (1957), Geophysics Research Directorate, AFCRC, Cambridge, Mass., Institute d'Astrophysique de l'University de Liege.