Cyclic Variability of the Circumstellar Disk of the Be Star zeta Tau 1. Long-Term Monitoring Observations
S. Stefl, Th. Rivinius, A.C. Carciofi, J-B. Le Bouquin, D. Baade, K.S. Bjorkman,
E. Hesselbach, C. Hummel, A.T. Okazaki, E. Pollmann, F. Rantakyro, J.P. Wisniewski, A&A, submitted (12/2008).
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