B., Tully, R.; R., Fisher, J. (). „A new method of determining distances to galaxies”. Astronomy and Astrophysics (în engleză). 54: 105. Bibcode:1977A&A....54..661T. ISSN0004-6361.
B., Tully, R.; R., Fisher, J. (). „A new method of determining distances to galaxies”. Astronomy and Astrophysics (în engleză). 54: 105. Bibcode:1977A&A....54..661T. ISSN0004-6361.