SIMBAD references

1979A&A....74...85S - Astronomy and Astrophysics, volume 74, 85-88 (1979)

The Butterfly Nebula M 2-9: its possible relation to Be stars and/or to protoplanetary nebula.

SWINGS J.P. and ANDRILLAT Y.

Journal keyword(s):

Simbad objects: 10

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