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Osborne, J. P.; et al. (August 1986), "A multi-wavelength study of the long-period AM Her system E2003+225 -I. The soft X-ray light curve and overall energy spectrum", Monthly Notices of the Royal Astronomical Society, 221 (4): 823–838, Bibcode:1986MNRAS.221..823O, doi:10.1093/mnras/221.4.823.
Beardmore, A. P.; et al. (April 1995), "ROSAT and GINGA observations of the magnetic cataclysmic variable QQ Vul: evidence for two-pole accretion", Monthly Notices of the Royal Astronomical Society, 273 (3): 742–750, Bibcode:1995MNRAS.273..742B, doi:10.1093/mnras/273.3.742.
Nousek, J. A.; et al. (February 1984), "E 2003+225 : a 3h42m AM Herculis type binary system.", Astrophysical Journal, 277: 682–691, Bibcode:1984ApJ...277..682N, doi:10.1086/161739.
Osborne, J. P.; et al. (August 1986), "A multi-wavelength study of the long-period AM Her system E2003+225 -I. The soft X-ray light curve and overall energy spectrum", Monthly Notices of the Royal Astronomical Society, 221 (4): 823–838, Bibcode:1986MNRAS.221..823O, doi:10.1093/mnras/221.4.823.
Beardmore, A. P.; et al. (April 1995), "ROSAT and GINGA observations of the magnetic cataclysmic variable QQ Vul: evidence for two-pole accretion", Monthly Notices of the Royal Astronomical Society, 273 (3): 742–750, Bibcode:1995MNRAS.273..742B, doi:10.1093/mnras/273.3.742.