00325nam a2200121 a 450000500170000002000150001708200180003210000150005024500590006526000430012430000210016770000150018820251203110715.0  a8180540308  a658.4034bGUP  aGupta, P.K  aProblems in Operations ResearchbMethods and Solutions  aNew DelhibSultan Chand & Sons.,c2003  a771p.c26 cm. PB  aMohan, Man