00437nam a2200145Ia 4500003000900000008004100009020001800050040001600068080001600084100002300100245009400123260003500217300001700252650002200269IN-BaIIA211028s9999    xx            000 0 eng d  a0-87692-135-7  cIIA Library  a681.31bHAN  aHansen, Per Brinch 0aOperating systems principlescPer Brinch Hansen                                            aNew DelhibPrentice-Hallc1984  axviii, 366p.  aOperating systems