por SPE Annual Technical Conference and Exhibition (1985 : Houston, Texas) | Society of Petroleum Engineers (Estados Unidos).
por Spe Annual Technical Conference And Exhibition (1988 : Houston, Texas) | Society of Petroleum Engineers (Estados Unidos).
por Middle East Oil Show (6 : 1989 : Bahrain Exhibition Centre) | Society of Petroleum Engineers (Estados Unidos).
por Middle East Oil Show (7 : 1991 : Manama, Bahrain) | Society of Petroleum Engineers (Estados Unidos).
por SPE International Symposium on oilfield chemistry (2001: Ho-uston, Texas).