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- [8] The dark lane of the bipolar nebula NGC 6302 PLANETARY NEBULAE AS ASTRONOMICAL TOOLS, 2005, 804 : 211 - 211
- [9] Detection of collimated bipolar outflows in the planetary nebula NGC 6572 shaping its nebular shell ASTROPHYSICAL JOURNAL, 1999, 520 (02): : 714 - 718
- [10] Herschel imaging of the dust in the Helix nebula (NGC 7293) ASTRONOMY & ASTROPHYSICS, 2015, 574