Toward a New Geometric Distance to the Active Galaxy NGC 4258. III. Final Results and the Hubble ConstantDOI: info:10.1088/0004-637X/775/1/13v. 77513
Humphreys, E. M. L., Reid, M. J., Moran, James M., Greenhill, L. J., and Argon, A. L. 2013. "Toward a New Geometric Distance to the Active Galaxy NGC 4258. III. Final Results and the Hubble Constant." The Astrophysical Journal, 775 13. https://doi.org/10.1088/0004-637X/775/1/13.