Shields, J. C., T. Böker, L. C. Ho, H.-W. Rix, R. P. van der Marel and C. J. Walcher: Chandra observations of the nuclear star cluster and ultraluminous X-ray sources in NGC 2139. In: The Astronomical Journal 144, (2012).
url: http://cdsads.u-strasbg.fr/abs/2012AJ....144...12S
Schmidt, K. B., H.-W. Rix, J. C. Shields, M. Knecht, D. W. Hogg, D. Maoz and J. Bovy: The color variability of quasars. 744, 2, (2012).
url: http://cdsads.u-strasbg.fr/abs/2012ApJ...744..147S
Shields, J. C., C. J. Walcher, T. Böker, L. C. Ho, H.-W. Rix and R. P. van der Marel: An accreting black hole in the nuclear star cluster of the bulgeless galaxy NGC 1042. In: The Astrophysical Journal 682, 104-109 (2008).
url: http://adsabs.harvard.edu/abs/2008ApJ...682..104S
Andersen, D. R., C. J. Walcher, T. Böker, L. C. Ho, R. P. van der Marel, H.-W. Rix and J. C. Shields: Caught in formation: The nuclear-cluster-to-Be in NGC 2139. In: The Astrophysical Journal 688, 990-999 (2008).
url: http://adsabs.harvard.edu/abs/2008ApJ...688..990A
Walsh, J. L., A. J. Barth, L. C. Ho, A. V. Filippenko, H.-W. Rix, J. C. Shields, M. Sarzi and W. L. W. Sargent: Hubble Space Telescope Spectroscopic observations of the narrow-line region in nearby low-luminosity active galactic nuclei. In: The Astronomical Journal 136, 1677-1702 (2008).
url: http://adsabs.harvard.edu/abs/2008AJ....136.1677W
Shields, J. C., H.-W. Rix, M. Sarzi, A. J. Barth, A. V. Filippenko, L. C. Ho, D. H. McIntosh, G. Rudnick and W. L. W. Sargent: The survey of nearby nuclei with the Space Telescope Imaging Spectrograph: emission-line nuclei at Hubble Space Telescope resolution. In: The Astrophysical Journal 654, 125-137 (2007).
url: http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2007ApJ...654..125S&db_key=AST
Rossa, J., R. P. van der Marel, T. Böker, J. Gerssen, L. C. Ho, H.-W. Rix, J. C. Shields and C.-J. Walcher: Hubble Space Telescope STIS spectra of nuclear star clusters in spiral galaxies: Dependence of age and mass on Hubble type. 132, 1074-1099 (2006).
url: http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2006AJ....132.1074R&db_key=AST
Sarzi, M., H.-W. Rix, J. C. Shields, L. C. Ho, A. J. Barth, G. Rudnick, A. V. Filippenko and W. L. W. Sargent: The stellar populations in the central parsecs of galactic bulges. In: The Astrophysical Journal 628, 1 Part 1, 169-186 (2005).
doi: 10.1086/428637
Sarzi, M., H.-W. Rix, J. C. Shields, L. C. Ho, A. J. Barth, G. Rudnick, A. V. Filippenko and W. L. W. Sargent: The stellar populations in the central Parsecs of galactic bulges. In: The Astrophysical Journal 628, 169-186 (2005).
url: http://adsabs.harvard.edu/cgi-bin/nph- bib_query?bibcode=2005ApJ...628..169S&db_key=AST&high=43327093fd20536
Böker, T., M. Sarzi, D. E. McLaughlin, R. P. van der Marel, H.-W. Rix, L. C. Ho and J. C. Shields: A Hubble Space Telescope census of nuclear star clusters in late-type spiral galaxies. II. Cluster sizes and structural parameter correlations. In: The Astronomical Journal 127, 105-118 (2004).
url: http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2004AJ....127..105B&db_key=AST
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