1. Section of Solid State and Theoretical Inorganic Chemistry, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany, http://www.mnf.uni‐tuebingen.de/fachbereiche/chemie/institute/ anorganische‐chemie/institut/ag‐meyer/startseite.html
2. Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada, http://home.cc.umanitoba.ca/~kroekers/people.html