Simon, Gérard, 1931; International Congress on the History of Sciences (20th : 1997 : Liège, Belgium; International Congress on the History of Sciences (20th : 1997 : Liège, Belgium). Proceedings of the XXth International Congress of History of Science (Liège, 20-26 July 1997) ; v. 12.; Débarbat, Suzanne.; Simon, Gérard, 1931-