1. Bard , J. 1979 The Development of a Patination Dating Technique for Great Basin Petroglyphs Using Neutron Activation3 Analysis and X-ray Fluorescence
2. Bard , J. Asaro , F. Heizer , R. 1976 Perspectives on Dating Great Basin Petroglyphs by Neutron Activation Analysis of Patinated Surfaces
3. Ambiguities in Direct Dating of Rock Surfaces Using Radiocarbon Measurements;Beck;Science,1998
4. Accuracy of Rock Varnish Chemical Analyses: Implications for CR Dating;Bierman;Geology,1991
5. Reply to T.A. Cahill's “Comment on Accuracy of Rock Varnish Chemical Analyses: Implications for CR Dating.”;Bierman;Geology,1992