00325nam a2200121Ia 4500082002100000100002300021245003400044260003500078300003000113490005000143500000500193700000500198  a518.542bH249.OS  aHansen, Per Brinch  aOperating system principlesb  aNew DelhibPrentice-Hallc1980  axviii, 366p. Index. Bibl.  aPrentice-Hall series in Automatic Computation  a  a