1. Faculty of Chemistry, University of Warsaw, 02-093 Warsaw, Pasteura 1, Poland
2. Faculty of Chemistry, University of Duisburg-Essen, Universitätsstraße 5, 45117 Essen, Germany
3. Interdisciplinary Centre for Mathematical and Computational Modelling, University of Warsaw, 00-838 Warsaw, Prosta 69, Poland
4. Department of Chemistry, Oakland University, Rochester, Michigan 48309-4477, USA