1. Valašské Meziříčí Observatory , Vsetínská 78, CZ-757 01 Valašské Meziříčí, Czech Republic
2. Czech Astronomical Society, Variable Star and Exoplanet Section , Vídeňská 1056, CZ-142 00 Praha 4, Czech Republic
3. Astronomical Institute, Faculty of Mathematics and Physics, Charles University Prague , V Holešovičkách 2, CZ-180 00 Praha 8, Czech Republic
4. Astronomical Institute, Academy of Sciences , Fričova 298, CZ-251 65 Ondřejov, Czech Republic
5. Research Centre for Theoretical Physics and Astrophysics, Institute of Physics, Silesian University in Opava , Bezručovo nám. 13, CZ-746 01 Opava, Czech Republic
6. Department of Theoretical Physics and Astrophysics, Masaryk University , Kotlářská 2, CZ-611 37 Brno, Czech Republic
7. South-Moravian Observatory , Chudčice 273, CZ-64771 Veverská Bítýška, Czech Republic