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024 _a77585
037 _cTextual
040 _aCSL
_beng
_cCSL
041 _aeng
082 _aD65,8(2:55), L8
100 _aOpen University
245 0 _cby Open University
_aSystems modelling : Units,5,6
260 _c1978
300 _ap.
_ccm.
650 _aElectronic engineering
942 _hD65,8(2:55), L8
_cTEXL
_2CC
999 _c38576
_d38576