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F. V. Hessman; V. S. Dhillon; D. E. Winget; M. R. Schreiber; et al. (2010). "On the naming convention used for multiple star systems and extrasolar planets": 4. arXiv:1012.0707. Bibcode:2010arXiv1012.0707H. {{cite journal}}: Cite journal requires |journal= (help)
Z. Arzoumanian; K. Joshi; F. A. Rasio; S. E. Thorsett (1999). "Orbital Parameters of the PSR B1620-26 Triple System". Proceedings of the 160th Colloquium of the International Astronomical Union. 105: 525. arXiv:astro-ph/9605141. Bibcode:1996ASPC..105..525A.
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F. V. Hessman; V. S. Dhillon; D. E. Winget; M. R. Schreiber; et al. (2010). "On the naming convention used for multiple star systems and extrasolar planets": 4. arXiv:1012.0707. Bibcode:2010arXiv1012.0707H. {{cite journal}}: Cite journal requires |journal= (help)