Ho, Luis C.; et al. (February 2002). "An Efficient Strategy to Select Targets for Gasdynamical Measurements of Black Hole Masses Using the Hubble Space Telescope". The Publications of the Astronomical Society of the Pacific. 114 (792): 137–143. arXiv:astro-ph/0110671. Bibcode:2002PASP..114..137H. doi:10.1086/338546. S2CID17982236.
Ho, Luis C.; et al. (February 2002). "An Efficient Strategy to Select Targets for Gasdynamical Measurements of Black Hole Masses Using the Hubble Space Telescope". The Publications of the Astronomical Society of the Pacific. 114 (792): 137–143. arXiv:astro-ph/0110671. Bibcode:2002PASP..114..137H. doi:10.1086/338546. S2CID17982236.
Ho, Luis C.; et al. (February 2002). "An Efficient Strategy to Select Targets for Gasdynamical Measurements of Black Hole Masses Using the Hubble Space Telescope". The Publications of the Astronomical Society of the Pacific. 114 (792): 137–143. arXiv:astro-ph/0110671. Bibcode:2002PASP..114..137H. doi:10.1086/338546. S2CID17982236.
Ho, Luis C.; et al. (February 2002). "An Efficient Strategy to Select Targets for Gasdynamical Measurements of Black Hole Masses Using the Hubble Space Telescope". The Publications of the Astronomical Society of the Pacific. 114 (792): 137–143. arXiv:astro-ph/0110671. Bibcode:2002PASP..114..137H. doi:10.1086/338546. S2CID17982236.