Leiter, Darryl J.; Robertson, Stanley L. (2003). "Does the principle of equivalence prevent trapped surfaces from being formed in the general relativistic collapse process?". Foundations of Physics Letters. 16 (2): 143. arXiv:astro-ph/0111421. doi:10.1023/A:1024170711427. S2CID123650253.
Leiter, Darryl J.; Robertson, Stanley L. (2003). "Does the principle of equivalence prevent trapped surfaces from being formed in the general relativistic collapse process?". Foundations of Physics Letters. 16 (2): 143. arXiv:astro-ph/0111421. doi:10.1023/A:1024170711427. S2CID123650253.
Leiter, Darryl J.; Robertson, Stanley L. (2003). "Does the principle of equivalence prevent trapped surfaces from being formed in the general relativistic collapse process?". Foundations of Physics Letters. 16 (2): 143. arXiv:astro-ph/0111421. doi:10.1023/A:1024170711427. S2CID123650253.