*001823548 *00520250613174210.0 *007ta *008020429s1997 xxu 000 u eng d *00900779cam a22002177c 4500 *019 $bl *035 $a(EXLNZ-47BIBSYS_NETWORK)990209771234702201 *035 $a(NO-LaBS)14680797(bibid) *035 $a(NO-TrBIB)020977123 *035 $a020977123-47bibsys_network *040 $aNO-TrBIB$bnob$ekatreg *24500$aStronger protection or technological revolution :$bwhat is behind the recent surge in patenting? *260 $aCambridge, Mass.$bNBER$c1997 *300 $a57,[15] s. *4901 $aNBER working paper series$v6204 *7001 $aKortum, Samuel$_51396400 *7001 $aLerner, Josh$_34064500 *7102 $aNational Bureau of Economic Research (Forente Stater)$_13074800 *830 0$aWorking paper series (National Bureau of Economic Research : trykt utg.)$x0898-2937$v6204$w999105437124702201$_13074900 *901 $a60 *999 $aoai:nb.bibsys.no:990209771234702202$b2021-11-14T20:52:21Z$z990209771234702202 ^