1. Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, United States
2. International Centre of Biodynamics, 1B Intrarea Portocalelor, Sector 6, 060101 Bucharest, Romania
3. Department of Mathematics, Clarkson University, Potsdam, New York 13699-5810, United States