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1974A&A....35..219G - Astronomy and Astrophysics, volume 35, 219-224 (1974)
High resolution radio interferometric observations of the planetary nebulae NGC 40, NGC 6543, and NGC 6720.
GEORGE D., KAFTAN-KASSIM M.A. and HARTSUIJKER A.P.
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Simbad objects: 3
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