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*1304 $aThe Bell journal of economics (trykt utg.)$_67692100
*21010$aBell j. econ.
*24514$aThe Bell journal of economics
*260  $aNew York$bAmerican Telephone and Telegraph Co.
*7760 $tThe Bell journal of economics (online)$w990122519684702201
*78000$tThe Bell journal of economics and management sciences (trykt utg.)$g5(1974)$w999011053684702201
*78500$tThe Rand journal of economics (trykt utg.)$g15(1984)$w999011043614702201
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