Muno, Michael P.; Clark, J. Simon; Crowther, Paul A.; Dougherty, Sean M.; De Grijs, Richard; Law, Casey; McMillan, Stephen L. W.; Morris, Mark R.; Negueruela, Ignacio; Pooley, David; Portegies Zwart, Simon; Yusef-Zadeh, Farhad et al. A Neutron Star with a Massive Progenitor in Westerlund 1 (англ.) // The Astrophysical Journal : journal. — IOP Publishing, 2006. — Vol. 636, no. 1. — P. L41. — doi:10.1086/499776. — Bibcode: 2006ApJ...636L..41M. — arXiv:astro-ph/0509408.
Ritchie, B. W.; Clark, J. S.; Negueruela, I.; Crowther, P. A. et al. A VLT/FLAMES survey for massive binaries in Westerlund 1: I. first observations of luminous evolved stars (англ.) // Pre-Print : journal. — 2009. — Vol. 507, no. 3. — P. 1585. — doi:10.1051/0004-6361/200912686. — Bibcode: 2009A&A...507.1585R. — arXiv:0909.3815.
Muno, Michael P.; Clark, J. Simon; Crowther, Paul A.; Dougherty, Sean M.; De Grijs, Richard; Law, Casey; McMillan, Stephen L. W.; Morris, Mark R.; Negueruela, Ignacio; Pooley, David; Portegies Zwart, Simon; Yusef-Zadeh, Farhad et al. A Neutron Star with a Massive Progenitor in Westerlund 1 (англ.) // The Astrophysical Journal : journal. — IOP Publishing, 2006. — Vol. 636, no. 1. — P. L41. — doi:10.1086/499776. — Bibcode: 2006ApJ...636L..41M. — arXiv:astro-ph/0509408.
Ritchie, B. W.; Clark, J. S.; Negueruela, I.; Crowther, P. A. et al. A VLT/FLAMES survey for massive binaries in Westerlund 1: I. first observations of luminous evolved stars (англ.) // Pre-Print : journal. — 2009. — Vol. 507, no. 3. — P. 1585. — doi:10.1051/0004-6361/200912686. — Bibcode: 2009A&A...507.1585R. — arXiv:0909.3815.
Muno, Michael P.; Clark, J. Simon; Crowther, Paul A.; Dougherty, Sean M.; De Grijs, Richard; Law, Casey; McMillan, Stephen L. W.; Morris, Mark R.; Negueruela, Ignacio; Pooley, David; Portegies Zwart, Simon; Yusef-Zadeh, Farhad et al. A Neutron Star with a Massive Progenitor in Westerlund 1 (англ.) // The Astrophysical Journal : journal. — IOP Publishing, 2006. — Vol. 636, no. 1. — P. L41. — doi:10.1086/499776. — Bibcode: 2006ApJ...636L..41M. — arXiv:astro-ph/0509408.
Ritchie, B. W.; Clark, J. S.; Negueruela, I.; Crowther, P. A. et al. A VLT/FLAMES survey for massive binaries in Westerlund 1: I. first observations of luminous evolved stars (англ.) // Pre-Print : journal. — 2009. — Vol. 507, no. 3. — P. 1585. — doi:10.1051/0004-6361/200912686. — Bibcode: 2009A&A...507.1585R. — arXiv:0909.3815.