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Orbital periods of cataclysmic variables identified by the SDSS - IV. SDSS J220553.98+115553.7 has stopped pulsating
Southworth, J. (John).  Monthly Notices of the Royal Astronomical Society.  v. Vol.388. no. No.2.   2008-08-01. p. 709 - 715... issn: 0035-8711 .   

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