Mrs. Astrid Sigel, Prof. Helmut Sigel and, c/o Dept. of Chemistry, Inorganic Chemistry, University of Basel, Spitalstrasse 51, CH-4056 Basel, Switzerland
Professor Roland K. O. Sigel, Institute of Inorganic Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland