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B. C. Whitmore, D. B. McElroy, F. Schweizer. The shape of the dark halo in polar-ring galaxies. Astrophysical Journal. 1987, 314: 439–456. Bibcode:1987ApJ...314..439W. doi:10.1086/165077.
F. Schweizer, B. C. Whitmore, V. C. Rubin. Colliding and merging galaxies. II - S0 galaxies with polar rings. Astronomical Journal. 1983, 88: 909–925. Bibcode:1983AJ.....88..909S. doi:10.1086/113377.