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Circumbinary, not transitional: on the spiral arms, cavity, shadows, fast radial flows, streamers, and horseshoe in the HD 142527 disc
Price, Daniel J.  Monthly Notices of the Royal Astronomical Society.  v. 477. no. 1.   2018-06-11. p. 1270 - 1284... issn: 1365-2966 .   

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