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Trautman, A. Editorial note to: J. Ehlers, F. A. E. Pirani and A. Schild, The geometry of free fall and light propagation. Gen Relativ Gravit 44, 1581–1586 (2012). https://doi.org/10.1007/s10714-012-1352-5
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DOI: https://doi.org/10.1007/s10714-012-1352-5