F. Schweizer, B. C. Whitmore, V. C. Rubin «Colliding and merging galaxies. II - S0 galaxies with polar rings». Astronomical Journal, 88, 1983, pàg. 909–925. Bibcode: 1983AJ.....88..909S. DOI: 10.1086/113377.
B. C. Whitmore, D. B. McElroy, F. Schweizer «The shape of the dark halo in polar-ring galaxies». Astrophysical Journal, 314, 1987, pàg. 439–456. Bibcode: 1987ApJ...314..439W. DOI: 10.1086/165077.
B. C. Whitmore, R. A. Lucas, D. B. McElroy, T. Y. Steiman-Cameron, P. D. Sackett, R. P. Olling «New observations and a photographic atlas of polar-ring galaxies». Astronomical Journal, 100, 1990, pàg. 1489–1522, 1721–1755. Bibcode: 1990AJ....100.1489W. DOI: 10.1086/115614.
Bertola, F. and Galletta, G. «A new type of galaxy with prolate structure». Astrophysical Journal, 226, 1978, pàg. L115–L118. Bibcode: 1978ApJ...226L.115B. DOI: 10.1086/182844.,
Varnas, S.R. Bertola, F., Galletta, G., Freeman, K.C., Carter, D. «NGC 5266 - an elliptical galaxy with a dust ring». Astrophysical Journal, 313, 1987, pàg. 69–88,. Bibcode: 1987ApJ...313...69V. DOI: 10.1086/164949.
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F. Schweizer, B. C. Whitmore, V. C. Rubin «Colliding and merging galaxies. II - S0 galaxies with polar rings». Astronomical Journal, 88, 1983, pàg. 909–925. Bibcode: 1983AJ.....88..909S. DOI: 10.1086/113377.
J. L. Sérsic «Southern Peculiar Galaxies III». Zeitschrift für Astrophysik, 67, 1967, pàg. 306–311. Bibcode: 1967ZA.....67..306S.
B. C. Whitmore, D. B. McElroy, F. Schweizer «The shape of the dark halo in polar-ring galaxies». Astrophysical Journal, 314, 1987, pàg. 439–456. Bibcode: 1987ApJ...314..439W. DOI: 10.1086/165077.
B. C. Whitmore, R. A. Lucas, D. B. McElroy, T. Y. Steiman-Cameron, P. D. Sackett, R. P. Olling «New observations and a photographic atlas of polar-ring galaxies». Astronomical Journal, 100, 1990, pàg. 1489–1522, 1721–1755. Bibcode: 1990AJ....100.1489W. DOI: 10.1086/115614.
Bertola, F. and Galletta, G. «A new type of galaxy with prolate structure». Astrophysical Journal, 226, 1978, pàg. L115–L118. Bibcode: 1978ApJ...226L.115B. DOI: 10.1086/182844.,