1. Buried impact craters: A topographic analysis of quasi-circular depressions, Utopia Basin, Mars;Buczkowski;J. Geophys. Res.,2005
2. Relative ages of the highlands, lowlands and transition zone along a portion of the Mars crustal dichotomy boundary from densities of visible and buried impact craters;DeSoto;Lunar Planet. Sci. Conf.,2005
3. Evidence for an earlier early Noachian on Mars, Spring 2002 AGU Meeting;Frey
4. Evidence for buried crust older than the oldest surface units on Mars;Frey
5. Buried impact basins and the earliest history of Mars;Frey