Heldmann, Jennifer L. e o seu equipo. (2005). "Formation of Martian gullies by the action of liquid water flowing under current Martian environmental conditions". Journal of Geophysical Research110: E05004. Bibcode:2005JGRE..11005004H. doi:10.1029/2004JE002261. para 3 page 2 Martian Gullies Mars#References
Heldmann, Jennifer L. e o seu equipo. (2005). "Formation of Martian gullies by the action of liquid water flowing under current Martian environmental conditions". Journal of Geophysical Research110: E05004. Bibcode:2005JGRE..11005004H. doi:10.1029/2004JE002261. para 3 page 2 Martian Gullies Mars#References