00496nam a2200121Ia 4500082001900000100004400019245019100063260004200254300000600296490004000302500000500342700002700347  a512.7bL573.CM  aLanstra, H. W. d jr. and Tijdeman, R.   aComputational methods in number theory; revised written versions of the lectures presented during the study week "Number theory & Computers" at the Mathematical Centre, Sept. 1-5, 1980b  aAmsterdambMathematisch Centrumc1982  a   aMathematical centre tractsv v. 155  a  aTijdeman, R. ; jt. ed.