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Bonanos, A. Z. et al. The First DIRECT Distance to a Detached Eclipsing Binary in M 33 // Astrophysics and Space Science. — 2006. — Vol. 304. — № 1-4. — P. 207. — DOI:10.1007/s10509-006-9112-1 — Bibcode: 2006Ap&SS.304..207B