Mercury's Geochronology Revised by applying Model Production Functions to Mariner 10 data: geological implications.
M. Massironi, G. Cremonese, S. Marchi, M. Martellato, M. Mottola, R.J. Wagner
http://arxiv.org/abs/0910.1399
http://www4.ncsu.edu/~lamclaug/Mercury.pdf