por Spe International Symposium On Oilfield Chemistry (1995 : San Antonio, Texas) | Society of Petroleum Engineers (Estados Unidos).
por SPE International Symposium on Oilfield Chemistry (1997 : Houston, Texas) | Society of Petroleum Engineers (Estados Unidos).
por Spe International Symposium On Oilfield Chemistry (1991 : Anaheim, California).
por Spe International Symposium On Oilfield Chemistry (1993 : New Orleans, Louisiana) | Society of Petroleum Engineers (Estados Unidos).
por SPE International Symposium on oilfield chemistry (2001: Ho-uston, Texas).