Feldmeier, John J.; Jacoby, George H.; Phillips, Mark M. (November 2006). «Calibrating Type Ia Supernovae using the Planetary Nebula Luminosity Function I. Initial Results». Eprint arXiv:astro-ph/0611231657 (1): 76. doi:10.1086/510897. Bibcode: 2006astro.ph.11231F.
Goudfrooij, Paul; Alonso, M. Victoria; Maraston, Claudia; Minniti, Dante (November 2001). «The star cluster system of the 3-Gyr-old merger remnant NGC 1316: clues from optical and near-infrared photometry». Monthly Notices of the Royal Astronomical Society328 (1): 237–256. doi:10.1046/j.1365-8711.2001.04860.x. Bibcode: 2001MNRAS.328..237G.
Feldmeier, John J.; Jacoby, George H.; Phillips, Mark M. (November 2006). «Calibrating Type Ia Supernovae using the Planetary Nebula Luminosity Function I. Initial Results». Eprint arXiv:astro-ph/0611231657 (1): 76. doi:10.1086/510897. Bibcode: 2006astro.ph.11231F.
Goudfrooij, Paul; Alonso, M. Victoria; Maraston, Claudia; Minniti, Dante (November 2001). «The star cluster system of the 3-Gyr-old merger remnant NGC 1316: clues from optical and near-infrared photometry». Monthly Notices of the Royal Astronomical Society328 (1): 237–256. doi:10.1046/j.1365-8711.2001.04860.x. Bibcode: 2001MNRAS.328..237G.