Robert Zinn, Conard C. Dahn: Variable 19 in NGC 5466: an anomalous cepheid in a globular cluster. In: Astronomical Journal. 81. Jahrgang, 1976, S.527–33, 565, doi:10.1086/111916, bibcode:1976AJ.....81..527Z.
Robert Zinn, Conard C. Dahn: Variable 19 in NGC 5466: an anomalous cepheid in a globular cluster. In: Astronomical Journal. 81. Jahrgang, 1976, S.527–33, 565, doi:10.1086/111916, bibcode:1976AJ.....81..527Z.