Schopf J William
Department of Earth and Space Sciences, Institute of Geophysics and Planetary Physics, Center for the Study of Evolution and the Origin of Life, and Molecular Biology Institute, University of California , Los Angeles, California, USA.
Astrobiology. 2011 Jan-Feb;11(1):9-14. doi: 10.1089/ast.2010.1129. Epub 2011 Feb 6.