1. Laboratory of Theoretical Chemistry, Institute of Chemistry, ELTE Eötvös Loránd University, P.O. Box 32, H-1117 Budapest, Hungary
2. György Hevesy Doctoral School, Institute of Chemistry, ELTE Eötvös Loránd University, H-1117 Budapest, Hungary
3. Quantum Theory Project, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States