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Orbital periods of cataclysmic variables identified by the SDSS - II. Measurements for six objects, including two eclipsing systems
Southworth, J. (John).  Monthly Notices of the Royal Astronomical Society.  v. Vol.382. no. No.3.   2007-12-11. p. 1145 - 1157... issn: 0035-8711 .   

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