Nikolic V.N.1, Vasic M.M.2, Milikic J.2, Mariano J.F.M.L.3,4
1Department of Theoretical and Condensed Matter Physics, "VINvCA" Institute of Nuclear Sciences --- National Institute of thе Republic of Serbia, University of Belgrade, Belgrade, Serbia
2Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, Serbia
3Universidade do Algarve, FCT, Campus de Gambelas,-139 Faro, Portugal
4Center of Physics and Engineering of Advanced Materials (CeFEMA), IST, Universidade de Lisboa, Av. Rovisco Pais,-001 Lisboa, Portugal
Email: violeta@vin.bg.ac.rs, mvasic@ffh.bg.ac.rs, jadranka@ffh.bg.ac.rs, jmariano@ualgt.pt