00314nam a2200121Ia 4500008004100000041001200041082001700053100002500070245002400095260003600119300001300155650002400168231217s9999    xx            000 0 und d  aEnglish  a001.424  GUP  aGupta P K. Hira, D S 0aOperations research  c1997bNew Delhi : Sultan Chand,  axiv+1055  aOperations research