D. Clowe; M. Bradač, et al. (2006). “A direct empirical proof of the existence of dark matter”. Astrophys. J. Lett.648: L109–L113. doi:10.1086/508162. (arXiv:astro-ph/0608407)
G.W. Angus; H.Y. Shan, et al. (2007). “On the law of gravity, the mass of neutrinos and the proof of dark matter”. Astrophys. J. Lett.654: L13–L16. doi:10.1086/510738. (arXiv:astro-ph/0609125)
D. Clowe; M. Bradač, et al. (2006). “A direct empirical proof of the existence of dark matter”. Astrophys. J. Lett.648: L109–L113. doi:10.1086/508162. (arXiv:astro-ph/0608407)
G.W. Angus; H.Y. Shan, et al. (2007). “On the law of gravity, the mass of neutrinos and the proof of dark matter”. Astrophys. J. Lett.654: L13–L16. doi:10.1086/510738. (arXiv:astro-ph/0609125)