Quantitative clay typing and lithological evaluation of subsurface formations Application US-4903527-A United States of America 27 Feb 1990
Quantitative determination by elemental logging of subsurface formation properties Grant US-4722220-A United States of America 02 Feb 1988
Quantitative determination by elemental logging of subsurface formation properties Grant US-4712424-A United States of America 15 Dec 1987