1. Katholieke Universiteit Leuven, Department MTM, de Croylaan 2, Leuven 3001, Belgium
2. Hoogovens Aluminium N. V., Quality Department, A Stocletlaan 87, Duffel 2570, Belgium
3. Hoogovens Corporate Research, P.O. Box 10000, IJmuiden 1970-CA, The Netherlands