1. CHEMIPAN, R&D Laboratories, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warszawa, Poland
2. Institut für Chemische Verfahrenstechnik, Universität Stuttgart, Böblinger Strasse 72, 70199 Stuttgart, Germany
3. DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands