00529nam a2200193 a 450000500170000002000150001708200170003210000170004924500360006626000340010230000220013669000200015869000230017870000140020196400250021599700180024099900150025895200620027320251203090452.0  a0074517872  a511.8b, nag  aNagrath, IJ.  aSystems: modelling and analysis  aDelhi: Tata McGraw-Hillc1986  axii,647p.c22 cm.  aSystem analysis  a<Computer science>  aGopal, M.  bENGc100de010fg_  a14457 LIBSC C  c8700d8700  00104070aPUbPUd1998-04-08l0o511.8 , nagp14457yBK