000			00356nam a2200145Ia 4500
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040			_e87821 _aMAIN
041			_aEnglish
082			_a004.2 N139S
100			_aNagrath, I J
245		0	_aSystems modelling and analysis
260			_aNew Delhi _bTata McGraw-Hill _c1987
300			_a647 p.
942			_cBK
999			_c81623 _d81623