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Orbital periods of cataclysmic variables identified by the SDSS. VI, The 4.5-h period eclipsing system SDSS J100658.40+233724.4
Southworth, J. (John).  Astronomy & Astrophysics.  v. Vol.507. no. No.2.   2009-11. p. 929 - 937... issn: 0004-6361 .   

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