Feast, Michael W.; Laney, Clifton D.; Kinman, Thomas D. et al. (2008). “The luminosities and distance scales of type II Cepheid and RR Lyrae variables”. Monthly Notices of the Royal Astronomical Society386 (4): 2115-2134. Bibcode: 2008MNRAS.386.2115F. doi:10.1111/j.1365-2966.2008.13181.x. ISSN0035-8711.
Feast, Michael W.; Laney, Clifton D.; Kinman, Thomas D. et al. (2008). “The luminosities and distance scales of type II Cepheid and RR Lyrae variables”. Monthly Notices of the Royal Astronomical Society386 (4): 2115-2134. Bibcode: 2008MNRAS.386.2115F. doi:10.1111/j.1365-2966.2008.13181.x. ISSN0035-8711.
Feast, Michael W.; Laney, Clifton D.; Kinman, Thomas D. et al. (2008). “The luminosities and distance scales of type II Cepheid and RR Lyrae variables”. Monthly Notices of the Royal Astronomical Society386 (4): 2115-2134. Bibcode: 2008MNRAS.386.2115F. doi:10.1111/j.1365-2966.2008.13181.x. ISSN0035-8711.