The Megamaser Cosmology Project. IV. A Direct Measurement of the Hubble Constant from UGC 3789DOI: info:10.1088/0004-637X/767/2/154v. 767154
Reid, M. J., Braatz, J. A., Condon, J. J., Lo, K. Y., Kuo, C. Y., Impellizzeri, C. M. V., and Henkel, C. 2013. "The Megamaser Cosmology Project. IV. A Direct Measurement of the Hubble Constant from UGC 3789." The Astrophysical Journal, 767 154. https://doi.org/10.1088/0004-637X/767/2/154.