1. Department of Physics Kocaeli University Izmit 41380 Turkey
2. SRTV ‐ Studioul TVR Iaşi University Appolonia 2 Muzicii street Iaşi 700399 Romania
3. Physics Department California State University at Fresno Fresno CA 93740 USA
4. Dep. Theoretical Physics and Computer Modelling Yu. Fedkovych Chernivtsi National University 101 Storozhynetska street Chernivtsi 58029 Ukraine