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HS 0139+0559, HS 0229+8016, HS 0506+7725, and HS 0642+5049 : four new long-period cataclysmic variables
Aungwerojwit, A..  Astronomy & Astrophysics.  v. Vol.443. no. No.3.   2005-12. p. 995 - 1005... issn: 0004-6361 .   

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