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The author of the bib entry [X] (former [7]) here is unclear. One has to check with the paper version of the Encycl.
Same for old bib [6] (which has no reference in the text).
:Ref [X] is presumably a work entitled "Die Quadratur des Kreises" (Squaring the circle).  One possibility is a paper by E. Gumbel in ''Das Neue Tage-Buch''.  However there are several possible more modern references for the work of Lambert in 1768 and Legendre in 1794 on the continued fraction for tan(x) and its irrationality for rational x: for example,"Analysis by Its History" by Ernst Hairer, Gerhard Wanner (Springer, 2008) ISBN 0387770313.  [[User:Richard Pinch|Richard Pinch]] ([[User talk:Richard Pinch|talk]]) 19:18, 4 September 2013 (CEST)