Measurements of Solar Protons, Helium and Heavy Nuclei in the Aug. 4, 1972 Solar Event Biswas, S. ; Bertsch, D. L. ; Fichtel, C. E. ; Pellerin, C. J. ; Reames, D. V. Abstract Publication: Bulletin of the American Astronomical Society Pub Date: March 1973 Bibcode: 1973BAAS....5T.269B