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100   $a20000920d1985----km-y0itay50------ba
101 0 $aENG
200 1 $aCompetitive advantage. Creating and Sustaining superior performace$fdi PORTER Micha el
205   $a$a
210   $aNew York$cThe Press Free$d1985
215   $a557 pp.$d24 cm
700  1$aPorter,$bMichael E.$f<1947- >$05334
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