por International Petroleum Conference (1994 : Veracruz, Ver.) | Society of Petroleum Engineers (Estados Unidos).
por SPE International Petroleum Conference and Exhibition of Mé-xico (2000 : Villahermosa, Tabasco).
por SPE International Petroleum Conference and Exhibition of Mexico (1998 : Villahermosa, Tabasco) | Society of Petroleum Engineers (Estados Unidos).
por SPE International Petroleum Conference & Exhibition in Mexi-co ( 10-12 feb. 2002 ; Villahermosa, México).