Collaborators:

1. Bozena Muchotrzeb Czerny, N. Copernicus Astronomical Centre, Warsaw, Poland.
2. Aneta Siemiginowska, CfA, Harvard University, USA.
3. Monika A. Moscibrodzka, University of Illinois, at Urbana-Champaign, USA.
4. Vladimir Karas, Astronomical Institute of the Academy of Sciences of the Czech Republic.
5. Daniel Proga, University of Nevada, Las Vegas, USA.