1. Department of Physical and Theoretical Chemistry and Materials Chemistry, Iaşi University “Al.I.Cuza”, RO-700506 Iaşi, Romania
2. Center for Complex and Nonlinear Systems and the Department of Physics, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
3. Dipartimento di Chimica Fisica “F. Accascina”, Università di Palermo, 90128 Palermo, Italy