Dougherty, B. L.; Freely, W. B.; Zirin, H.; Gary, D. E.; Hurford, G. J. (2000). High energy solar physics : anticipating HESSI : proceedings of a conference held in College Park, Maryland, 18-20 October, 1999. Vol. 206. Astronomical Society of the Pacific. p. 367. Bibcode:2000ASPC..206..367D. ISBN978-1-58381-033-0. {{cite book}}: |journal= ignored (help)