Recent and episodic volcanic and glacial activity on Mars revealed by the High Resolution Stereo Camera - Jaumann, R.; Hoffmann, H.; Hauber, E.; Head, J. W.; Basilevsky, A. T.; Ivanov, B. A.; Werner, S. C.; van Gasselt, S.; Murray, J. B.; McCord, T.; HRSC Co-Investigator Team, The; Neukum, G. (Macmillian Magazines Ltd., 2004)
http://dx.doi.org/10.1038/nature03231
Keywords: W; V; WW-YZ; TA-TD; U