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200 1 $a<<The >>economic theory of product differentiation$fJohn Beath and Yannis Katsoulacos
210   $aCambridge$cCambridge University Press$d1991.
215   $aX, 212 p.$d23 cm
610 0 $aDifferenziazione dei prodotti
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996   $aEconomic theory of product differentiation$9394603
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