Jordi, K.; Grebel, E. K.; Hilker, M.; Baumgardt, H.; Frank, M.; Kroupa, P.; Haghi, H.; CBtE, P.; Djorgovski, S. G. (2009). "Testing Fundamental Physics with Distant Star Clusters: Analysis of Observational Data on Palomar 14". The Astronomical Journal. 137 (6): 4586–4596. arXiv:0903.4448. Bibcode:2009AJ....137.4586J. doi:10.1088/0004-6256/137/6/4586.
Jordi, K.; Grebel, E. K.; Hilker, M.; Baumgardt, H.; Frank, M.; Kroupa, P.; Haghi, H.; CBtE, P.; Djorgovski, S. G. (2009). "Testing Fundamental Physics with Distant Star Clusters: Analysis of Observational Data on Palomar 14". The Astronomical Journal. 137 (6): 4586–4596. arXiv:0903.4448. Bibcode:2009AJ....137.4586J. doi:10.1088/0004-6256/137/6/4586.
Jordi, K.; Grebel, E. K.; Hilker, M.; Baumgardt, H.; Frank, M.; Kroupa, P.; Haghi, H.; CBtE, P.; Djorgovski, S. G. (2009). "Testing Fundamental Physics with Distant Star Clusters: Analysis of Observational Data on Palomar 14". The Astronomical Journal. 137 (6): 4586–4596. arXiv:0903.4448. Bibcode:2009AJ....137.4586J. doi:10.1088/0004-6256/137/6/4586.