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1983IAUS..103..539P - IAU Symp., 103, held at University College, London, U.K. August 9-13, 1982 Ed. by D.R. Flower., 103, 539 (1983)
Why is IC 4642 of such high-excitation class ?
PENN C.J., FLOWER D.R., BARLOW M.J., SEATON M.J. and ALLER L.H.
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Simbad objects: 1
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