May 17, 2012 07:05 am
Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/kklS_L1HcZk/worlds-subways-share-common-mathematical-structure
World's Subways Share Common Mathematical Structure
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Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/kklS_L1HcZk/worlds-subways-share-common-mathematical-structure
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