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Causality violation without time-travel: closed lightlike paths in G\"{o}del's universe. (arXiv:1911.08602v1 [gr-qc]) http://arxiv.org/abs/1911.08602
Causality violation without time-travel: closed lightlike paths in G\"{o}del's universe. (arXiv:1911.08602v1 [gr-qc]) http://arxiv.org/abs/1911.08602