Separation between RR Lyrae and type II Cepheids and their importance for a distance determination: the case of omega Cen
V. F. Braga, G. Bono, G. Fiorentino, P. B. Stetson, M. Dall’Ora, M. Salaris, R. da Silva, M. Fabrizio, S. Marinoni, M. P. Marrese, M. Mateo, N. Matsunaga, M. Monelli and G. Wallerstein
