McEwan, Alfred S.; Bierhaus, Edward B. (31 January 2006). "The Importance of Secondary Cratering to Age Constraints on Planetary Surfaces". Annual Review of Earth and Planetary Sciences. 34: 535–567. Bibcode:2006AREPS..34..535M. doi:10.1146/annurev.earth.34.031405.125018.
McEwan, Alfred S.; Bierhaus, Edward B. (31 January 2006). "The Importance of Secondary Cratering to Age Constraints on Planetary Surfaces". Annual Review of Earth and Planetary Sciences. 34: 535–567. Bibcode:2006AREPS..34..535M. doi:10.1146/annurev.earth.34.031405.125018.