SIMBAD references

1990A&A...233..540T - Astronomy and Astrophysics, volume 233, 540-552 (1990)

Planetary nebulae with a high degree of ionization: NGC 2242 and NGC 4361.

TORRES-PEIMBERT S., PEIMBERT M. and PENA M.

Journal keyword(s):

Simbad objects: 6

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