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Elevator paradox
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==References== <references/> * [[Martin Gardner]], ''Knotted Doughnuts and Other Mathematical Entertainments'', chapter 10. W H Freeman & Co.; (October 1986). {{ISBN|0-7167-1799-9}}. * Martin Gardner, ''Aha! Gotcha'', page 96. W H Freeman & Co.; 1982. {{ISBN|0-7167-1414-0}} *Marvin Stern, George Gamow, ''Puzzle Math,'' Viking Press; 1958. {{ISBN|0-670-58335-9|}} *Donald E. Knuth, ''Selected Papers on Fun & Games,'' CSLI Publications; 2011. {{ISBN|1-575-86584-X|}}
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