1. Department of Physics, Faculty of Science and Art, Balikesir University, 10145 Balikesir, Turkey, http://w3.balikesir.edu.tr/~egungor http://w3.balikesir.edu.tr/~hkara
2. Departamento de Química Inorgánica, Universidad de Granada, 18071 Granada, Spain, http://inorganica.ugr.es http://www.ugr.es/local/mota