Tocknell, James; et al. (April 2014), "Constraints on common envelope magnetic fields from observations of jets in planetary nebulae", Monthly Notices of the Royal Astronomical Society, 439 (2): 2014–2024, arXiv:1308.5027, Bibcode:2014MNRAS.439.2014T, doi:10.1093/mnras/stu079.
Jones, D.; et al. (January 2016), "NGC 6778: strengthening the link between extreme abundance discrepancy factors and central star binarity in planetary nebulae", Monthly Notices of the Royal Astronomical Society, 455 (3): 3263–3272, arXiv:1510.07516, Bibcode:2016MNRAS.455.3263J, doi:10.1093/mnras/stv2519.
Tocknell, James; et al. (April 2014), "Constraints on common envelope magnetic fields from observations of jets in planetary nebulae", Monthly Notices of the Royal Astronomical Society, 439 (2): 2014–2024, arXiv:1308.5027, Bibcode:2014MNRAS.439.2014T, doi:10.1093/mnras/stu079.
Jones, D.; et al. (January 2016), "NGC 6778: strengthening the link between extreme abundance discrepancy factors and central star binarity in planetary nebulae", Monthly Notices of the Royal Astronomical Society, 455 (3): 3263–3272, arXiv:1510.07516, Bibcode:2016MNRAS.455.3263J, doi:10.1093/mnras/stv2519.
Tocknell, James; et al. (April 2014), "Constraints on common envelope magnetic fields from observations of jets in planetary nebulae", Monthly Notices of the Royal Astronomical Society, 439 (2): 2014–2024, arXiv:1308.5027, Bibcode:2014MNRAS.439.2014T, doi:10.1093/mnras/stu079.
Jones, D.; et al. (January 2016), "NGC 6778: strengthening the link between extreme abundance discrepancy factors and central star binarity in planetary nebulae", Monthly Notices of the Royal Astronomical Society, 455 (3): 3263–3272, arXiv:1510.07516, Bibcode:2016MNRAS.455.3263J, doi:10.1093/mnras/stv2519.