TY - RPRT TI - Observations of the northern seasonal polar cap on Mars: I. Spring sublimation activity and processes AU - C.J. Hansen AU - Shane Byrne AU - Ganna Portyankina AU - Mary C. Bourke AU - Colin M. Dovichin AU - Alfred S. McEwen AU - Michael T. Mellon AU - Antoine Pommerol AU - N. Thomas PY - 2013 DO - 10.1016/j.icarus.2012.09.024 UR - https://pubs.usgs.gov/publication/70047201 ID - 70047201 ER -