Variability of apatite fission-track annealing kinetics; III, Extrapolation to geological time scales Ketcham, Richard A. ; Donelick, Raymond A. ; Carlson, William D. Abstract Publication: American Mineralogist Pub Date: September 1999 DOI: 10.2138/am-1999-0903 Bibcode: 1999AmMin..84.1235K