1. Department of Astronomy, Faculty of Mathematics University of Belgrade Belgrade Serbia
2. PIFI Research Fellow, Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
3. Hamburger Sternwarte Universitat Hamburg Hamburg Germany
4. Astronomical Observatory Belgrade Serbia
5. Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA
6. Millennium Institute of Astrophysics (MAS) Santiago Chile
7. NSF's NOIRLab Tucson Arizona USA