00302nam a2200121Ia 4500082001700000100002100017245003600038260004200074300001600116490003800132500000500170700000500175  a514bW231.FA  aWalt, T. Van Der  aFixed and almost fixed pointsb  aAmsterdambMathematisch Centrumc1975  a128p. Bibl.  aMathematical centre tractsv v. 1  a  a