(en) Ken D. Olum, « Can a circulating light beam produce a time machine? », Foundations of Physics Letters, vol. 18, no 4, , p. 379–385 (DOI10.1007/s10702-005-7127-4, arXivgr-qc/0410078)
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(en) Ken D. Olum, « Can a circulating light beam produce a time machine? », Foundations of Physics Letters, vol. 18, no 4, , p. 379–385 (DOI10.1007/s10702-005-7127-4, arXivgr-qc/0410078)