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*1001 $aCawley, John$0(NO-TrBIB)90830794$_29454300
*24510$aFactor substitution and unobserved factor quality in nursing homes$cJohn Cawley, David C. Grabowski, Richard A. Hirth
*260  $aCambridge, Mass.$bNational Bureau of Economic Research$c2004
*300  $a36 s.$bill.
*4901 $aWorking paper series / National Bureau of Economic Research$v10465
*7001 $aGrabowski, David C.$0(NO-TrBIB)4050721$_120406900
*7001 $aHirth, Richard A.$0(NO-TrBIB)4050720$_120407000
*830 0$aWorking paper series (National Bureau of Economic Research : trykt utg.)$x0898-2937$v10465$w999105437124702201$_13074900
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