Research Group of Theoretical Molecular Electronics and Spintronics
Vilnius University Institute of Theoretical Physics and Astronomy, rooms 347 and 453, A. Gostauto 12, Vilnius 2600, Lithuania
e-mail: Arvydas.Tamulis@tfai.vu.lt ; fax:+370-5-2125361; phones:+370-5-2193263, +370-69919397