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SOFIA observations of the planetary nebula NGC 7009:

Rubin, R. H. ; Colgan, S. W. J. ; Corradi, R. L. M....
Proceedings of the International Astronomical Union.  7 (2011)  S283 - p. 67-70 , 2011
Link: https://doi.org/10.1017/s174392131201071x