1. Faculty of Chemistry University of Warsaw, Pasteur 1, 02093 Warsaw, Poland, Fax: +48‐22‐5540801
2. Interdisciplinary Center for Mathematical and Computational Modelling, University of Warsaw, Pawinskiego 5a, 02106 Warsaw, Poland
3. Department of Inorganic Chemistry and Technology, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
4. University of Ljubljana, Faculty of Civil and Geodetic Engineering, and Institute of Mathematics, Physics and Mechanics, Jadranska 19, 1000 Ljubljana, Slovenia