Beuermann, K.; Wheatley, P.; Ramsay, G.; Euchner, F.; Gänsicke, B. T. Evidence for a substellar secondary in the magnetic cataclysmic binary EF Eridani (англ.) // Astronomy and Astrophysics Letters : journal. — 2000. — February (vol. 354). — P. L49—L52. — Bibcode: 2000A&A...354L..49B. — arXiv:astro-ph/0001183.
Beuermann, K.; Wheatley, P.; Ramsay, G.; Euchner, F.; Gänsicke, B. T. Evidence for a substellar secondary in the magnetic cataclysmic binary EF Eridani (англ.) // Astronomy and Astrophysics Letters : journal. — 2000. — February (vol. 354). — P. L49—L52. — Bibcode: 2000A&A...354L..49B. — arXiv:astro-ph/0001183.