por International Congress Of Crystallography (13 : 1984 : Hamburgo, Republica Federal Alemana) | Freie und Hansestadt Herford | Deutsche Forschungsgemeinschaft.
por International Congress of Crystallography (12 : 1981 : Otawa, Canada) | National Research Council of Canada | Congress International de Cristallographie (12 : 1981 : Otawa, Canada).