1. American Association of Variable Star Observers (AAVSO), 49 Bay State Rd, Cambridge, MA 02138, USA
2. Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne e.V. (BAV), Munsterdamm 90, D-12169 Berlin, Germany
3. Department of Physics and Astronomy, University of Wisconsin Oshkosh, 800 Algoma Boulevard, Oshkosh, WI 54901, USA
4. Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic
5. Mirranook Observatory, Boorolong Rd, Armidale, NSW 2350, Australia