| Institution: | Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QJ;Middle East Technical University, Physics Department, 06531 Ankara, Turkey;N. Copernicus Astronomical Centre, Polish Academy of Sciences, ul. Bartycka 18, 00–716 Warsaw, Poland;Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30–244 Cracow, Poland;Mt. Suhora Observatory, Pedagogical University, ul. Podchorazych 2, 30-084 Cracow, Poland;Observatorio Astronomico Nacional, IA UNAM, Aptdo Postal 877, 22800 Ensenada, BC, Mexico |
