00327nam a2200133Ia 4500008004100000020001500041041001200056100002000068245004900088250000800137260002500145300000900170650001400179221030s9999    xx            000 0 und d  a8120339040  aEnglish  aA. S. Tanenbaum 0aModern Operating systemscby A. S. Tanenbaum  a4th  bPHIaNew Delhic2012  a1076  aComputers