Paper:	Precessing Accretion Discs in Binary Systems
Volume:	310, Variable Stars in the Local Group (IAU Colloquium 193)
Page:	391
Authors:	Retter, A.; Liu, A.; Bos, M.
Abstract:	Superhumps – quasi-periodic oscillations at periods a few percent different than the orbital periods – have been observed in several dozen binary systems of various types. It is well-accepted now that they are caused by the precession of the accretion disc. New findings on TV Col, TX Col and V4742 Sgr are presented. These cataclysmic variables (CVs) have exceptional precessing periods that cast strong doubt on the predictions of the Tidal Disc Instability model.

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