^Jensen, Joseph B.; Tonry, John L.; Barris, Brian J.; Thompson, Rodger I.; Liu, Michael C.; Rieke, Marcia J.; Ajhar, Edward A.; Blakeslee, John P. Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations. Astrophysical Journal. February 2003, 583 (2): 712–726. Bibcode:2003ApJ...583..712J. arXiv:astro-ph/0210129. doi:10.1086/345430.
^Feldmeier, John J.; Jacoby, George H.; Phillips, Mark M. Calibrating Type Ia Supernovae using the Planetary Nebula Luminosity Function I. Initial Results. Eprint arXiv:astro-ph/0611231. November 2006, 657 (1): 76. Bibcode:2006astro.ph.11231F. arXiv:astro-ph/0611231. doi:10.1086/510897.