@book {MR1201816,
    AUTHOR = {Courant, Richard and Robbins, Herbert},
     TITLE = {Was ist {M}athematik?},
   EDITION = {Fourth},
      NOTE = {Translated from the English by Iris Runge,
              With a foreword by S. Hildebrandt},
 PUBLISHER = {Springer-Verlag},
   ADDRESS = {Berlin},
      YEAR = {1992},
     PAGES = {xxii+399},
      ISBN = {3-540-55743-1},
   MRCLASS = {00A05 (01A75)},
  MRNUMBER = {1201816 (93k:00002)},
  BOEKCODE = {00A05},
}

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