Chornay, N.; Walton, N. A.; Jones, D.; Boffin, H. M. J.; Rejkuba, M.; Wesson, R. (2021). ”Towards a more complete sample of binary central stars of planetary nebulae with Gaia”. Astronomy & Astrophysics 648: sid. A95. doi:10.1051/0004-6361/202140288. Bibcode: 2021A&A...648A..95C.
harvard.edu
adsabs.harvard.edu
Sabbadin, F.; Benetti, S.; Cappellaro, E.; Turatto, M. (2000). ”The tetra-lobed planetary nebula NGC 1501”. Astronomy and Astrophysics 361: sid. 1112–1120. Bibcode: 2000A&A...361.1112S.
Chornay, N.; Walton, N. A.; Jones, D.; Boffin, H. M. J.; Rejkuba, M.; Wesson, R. (2021). ”Towards a more complete sample of binary central stars of planetary nebulae with Gaia”. Astronomy & Astrophysics 648: sid. A95. doi:10.1051/0004-6361/202140288. Bibcode: 2021A&A...648A..95C.