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- [5] First detections of molecular gas associated with the Wolf-Rayet ring nebula NGC 3199 ASTROPHYSICAL JOURNAL, 2001, 563 (02): : 875 - 882
- [7] Spectroscopic observations of the planetary nebula NGC 6818 ASTROPHYSICAL JOURNAL, 1999, 514 (02): : 878 - 894
- [8] SOFIA observations of the planetary nebula NGC 7009 PLANETARY NEBULAE: AN EYE TO THE FUTURE, 2012, (283): : 67 - +
- [9] INFRARED OBSERVATIONS OF PLANETARY NEBULA NGC 7027 ASTROPHYSICAL JOURNAL, 1967, 149 (3P2): : L97 - &
- [10] The symmetric dust shell of the bipolar nebula NGC 6537 PLANETARY NEBULAE AS ASTRONOMICAL TOOLS, 2005, 804 : 212 - 212