@book {MR0222517,
    AUTHOR = {Cheney, E. W.},
     TITLE = {Introduction to approximation theory},
 PUBLISHER = {McGraw-Hill Book Co.},
   ADDRESS = {New York},
      YEAR = {1966},
     PAGES = {xii+259},
   MRCLASS = {41.00},
  MRNUMBER = {0222517 (36 \#5568)},
MRREVIEWER = {P. L. Butzer},
  BOEKCODE = {41-xx},
}

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