SIMBAD references

1978IAUS...76..290A - IAU Symp. 76, held at Cornell University, Ithaca, New York, USA, June 6-10, 1977. Planetary nebulae. Observations and theory. Ed by Y. Terzian., 76, 290-291 (1978)

The structure of NGC 6720 : the ring nebula in Lyra.

ATHERTON P.D., HICKS T.R., REAY N.K., WORSWICK S.P. and SMITH W.H.

Journal keyword(s):

Simbad objects: 1

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