00370nam a2200145Ia 4500008004100000020001500041041000800056082001300064100003300077245002500110250000600135260004500141300001400186650002400200210716s2012    xx            000 0 und d  a8121902819  aeng  a003 GUPP  aGupta, Prem Kumar;Hira, D S.  aOperations research.  a1  aNew DelhibS Chand and Company Ltdc2012  a1055/2004  aOperations Research