J. Boyles, D. R. Lorimer, P. J. Turk, R. Mnatsakanov, R. S. Lynch, S. M. Ransom, P. C. Freire, K. Belczynski: Young Radio Pulsars in Galactic Globular Clusters. In: The Astrophysical Journal. 742. Jahrgang, Nr.1, November 2011, doi:10.1088/0004-637X/742/1/51, arxiv:1108.4402, bibcode:2011ApJ...742...51B.
doi.org
George O. Abell: Globular Clusters and Planetary Nebulae Discovered on the National Geographic Society-Palomar Observatory Sky Survey. In: Publications of the Astronomical Society of the Pacific. 67. Jahrgang, Nr.397, 1955, S.258, doi:10.1086/126815, bibcode:1955PASP...67..258A.
J. Boyles, D. R. Lorimer, P. J. Turk, R. Mnatsakanov, R. S. Lynch, S. M. Ransom, P. C. Freire, K. Belczynski: Young Radio Pulsars in Galactic Globular Clusters. In: The Astrophysical Journal. 742. Jahrgang, Nr.1, November 2011, doi:10.1088/0004-637X/742/1/51, arxiv:1108.4402, bibcode:2011ApJ...742...51B.
harvard.edu
ui.adsabs.harvard.edu
George O. Abell: Globular Clusters and Planetary Nebulae Discovered on the National Geographic Society-Palomar Observatory Sky Survey. In: Publications of the Astronomical Society of the Pacific. 67. Jahrgang, Nr.397, 1955, S.258, doi:10.1086/126815, bibcode:1955PASP...67..258A.
J. Boyles, D. R. Lorimer, P. J. Turk, R. Mnatsakanov, R. S. Lynch, S. M. Ransom, P. C. Freire, K. Belczynski: Young Radio Pulsars in Galactic Globular Clusters. In: The Astrophysical Journal. 742. Jahrgang, Nr.1, November 2011, doi:10.1088/0004-637X/742/1/51, arxiv:1108.4402, bibcode:2011ApJ...742...51B.