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Read on 15 May 1970 at the Gwatt Seminar on the Bearings of Topology upon General Relativity
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Kronheimer, E.H. Time-ordering and topology. Gen Relat Gravit 1, 261–268 (1971). https://doi.org/10.1007/BF00759537
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DOI: https://doi.org/10.1007/BF00759537