40th Lunar and Planetary Science Conference (2009) (页面存档备份,存于互联网档案馆) D. A. Williams, R. Greeley, L. Manfredi, R. L. Fergason, J-Ph. Combe, F. Poulet, P. Pinet, C. Rosemberg, H. Clenet, T. B. McCord, J. Raitala, G. Neukum, The Circum-Hellas Volcanic Province, Mars: Detailed Area-Age Estimates and Physical-Compositional Properties of the Surface.
40th Lunar and Planetary Science Conference (2009) (页面存档备份,存于互联网档案馆) D. A. Williams, R. Greeley, L. Manfredi, R. L. Fergason, J-Ph. Combe, F. Poulet, P. Pinet, C. Rosemberg, H. Clenet, T. B. McCord, J. Raitala, G. Neukum, The Circum-Hellas Volcanic Province, Mars: Detailed Area-Age Estimates and Physical-Compositional Properties of the Surface.