Bibliography: https://arxiv.org/ftp/arxiv/papers/1006/1006.3913.pdf https://arxiv.org/ftp/arxiv/papers/1010/1010.0765.pdf http://firstsundaydoomsday.blogspot.ca/ http://quasar.as.utexas.edu/BillInfo/doomsday.html http://rudy.ca/doomsday.html
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