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1987IAUS..122..501G - 122nd Symposium of the IAU held in Heidelberg, F.R.G., June 23-27, 1986 Ed. by I. Appenzeller and C. Jordan. Circumstellar matter, 122, 501-502 (1987)
Atomic hydrogen in the planetary nebula IC 4997.
GIOVANARDI C., ALTSCHULER D.R., SCHNEIDER S.E. and SILVERGLATE P.R.
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Simbad objects: 1
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