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WikiPedia: เวลา http://www.friesian.com/space.htm#clarke http://www.friesian.com/space.htm#kant http://plato.stanford.edu/archives/sum2004/entries... http://plato.stanford.edu/archives/win2004/entries... http://plato.stanford.edu/archives/win2007/entries... http://plato.stanford.edu/entries/newton-stm/ http://plato.stanford.edu/entries/spacetime-bebeco... http://www-philosophy.ucdavis.edu/mattey/kant/TIME... http://www.iep.utm.edu/k/kantmeta.htm#H4/ http://www.iep.utm.edu/l/leib-met.htm#H7/