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*019  $bl
*035  $a(EXLNZ-47BIBSYS_NETWORK)990310710074702201
*035  $a(NO-LaBS)13871260(bibid)
*035  $a(NO-TrBIB)031071007
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*040  $aNO-TrBIB$bnob$ekatreg
*24500$aProspects for improving U.S. patent quality via post-grant opposition$cBronwyn H. Hall ... [et al.]
*260  $aCambridge, Mass.$bNational Bureau of Economic Research$c2003
*300  $a19, [5] s.$cill.
*4901 $aWorking paper series / National Bureau of Economic Research$v9731
*7001 $aHall, Bronwyn H.$0(NO-TrBIB)2034105$_30008900
*830 0$aWorking paper series (National Bureau of Economic Research : trykt utg.)$x0898-2937$v9731$w999105437124702201$_13074900
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*999  $aoai:nb.bibsys.no:990310710074702202$b2021-11-14T19:53:55Z$z990310710074702202
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