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Nagrath I.J, Nagrath I.J. & Gopal M, . (2004). System Modeling and Analysis. : Tata McGraw-Hill.
Nagrath I.J, Nagrath I.J. & Gopal M, . 2004. System Modeling and Analysis. : Tata McGraw-Hill.
Nagrath I.J, Nagrath I.J. & Gopal M, . System Modeling and Analysis. : Tata McGraw-Hill. 2004.
