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Maximal extension of the Schwarzschild metric: From Painlev\'e-Gullstrand to Kruskal-Szekeres. (arXiv:2005.14211v1 [gr-qc]) http://arxiv.org/abs/2005.14211
Maximal extension of the Schwarzschild metric: From Painlev\'e-Gullstrand to Kruskal-Szekeres. (arXiv:2005.14211v1 [gr-qc]) http://arxiv.org/abs/2005.14211