Gieren, W. P.;Welch, D. L.;Mermilliod, J.-C.;Matthews, J. M.;Hertling, G.(June 1994).«Independent distance determinations to Milky Way Cepheids in open clusters and associations. 1: The binary Cepheid DL CAS in NGC 129».The Astronomical Journal107(6): 2093–2100.doi:10.1086/117019.Bibcode:1994AJ....107.2093G.
Richard I. Anderson;Laurent Eyer;Nami Mowlavi(25 June 2013).«Cepheids in Open Clusters: An 8-D All-sky Census».Monthly Notices of the Royal Astronomical Society434(3): 2238–2261.doi:10.1093/mnras/stt1160.Bibcode:2013MNRAS.434.2238A.
Gieren, W. P.;Welch, D. L.;Mermilliod, J.-C.;Matthews, J. M.;Hertling, G.(June 1994).«Independent distance determinations to Milky Way Cepheids in open clusters and associations. 1: The binary Cepheid DL CAS in NGC 129».The Astronomical Journal107(6): 2093–2100.doi:10.1086/117019.Bibcode:1994AJ....107.2093G.
Richard I. Anderson;Laurent Eyer;Nami Mowlavi(25 June 2013).«Cepheids in Open Clusters: An 8-D All-sky Census».Monthly Notices of the Royal Astronomical Society434(3): 2238–2261.doi:10.1093/mnras/stt1160.Bibcode:2013MNRAS.434.2238A.