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Freedman, Wendy L.; Madore, Barry F.; Gibson, Brad K.; Ferrarese, Laura; Kelson, Daniel D.; Sakai, Shoko; Mould, Jeremy R.; Kennicutt, Jr., Robert C.; Ford, Holland C.; Graham, John A.; Huchra, John P.; Hughes, Shaun M. G.; Illingworth, Garth D.; Macri, Lucas M.; Stetson, Peter B. (2001). «Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant». The Astrophysical Journal. 553 (1): 47–72. Bibcode:2001ApJ...553...47F. arXiv:astro-ph/0012376. doi:10.1086/320638
Udalski, A.; Soszynski, I.; Szymanski, M.; Kubiak, M.; Pietrzynski, G.; Wozniak, P.; Zebrun, K. (1999). «The Optical Gravitational Lensing Experiment. Cepheids in the Magellanic Clouds. IV. Catalog of Cepheids from the Large Magellanic Cloud». Acta Astronomica. 49: 223–317. Bibcode:1999AcA....49..223U. arXiv:astro-ph/9908317
Soszynski, I.; Poleski, R.; Udalski, A.; Szymanski, M. K.; Kubiak, M.; Pietrzynski, G.; Wyrzykowski, L.; Szewczyk, O.; Ulaczyk, K. (2008). «The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. I. Classical Cepheids in the Large Magellanic Cloud». Acta Astronomica. 58. 163 páginas. Bibcode:2008AcA....58..163S. arXiv:0808.2210
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Freedman, Wendy L.; Madore, Barry F.; Gibson, Brad K.; Ferrarese, Laura; Kelson, Daniel D.; Sakai, Shoko; Mould, Jeremy R.; Kennicutt, Jr., Robert C.; Ford, Holland C.; Graham, John A.; Huchra, John P.; Hughes, Shaun M. G.; Illingworth, Garth D.; Macri, Lucas M.; Stetson, Peter B. (2001). «Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant». The Astrophysical Journal. 553 (1): 47–72. Bibcode:2001ApJ...553...47F. arXiv:astro-ph/0012376. doi:10.1086/320638
Bergh, Sidney van den (6 de junho de 2011). «The Curious Case of Lemaitre's Equation No. 24». Journal of the Royal Astronomical Society of Canada. 105 (4): 151. Bibcode:2011JRASC.105..151V. arXiv:1106.1195