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*24504$aThe sexual activity and birth control use of american teenagers$cby Phillip B. Levine
*260  $aCambridge, Mass.$bNBER$c2000
*300  $a46 s.
*4901 $aNBER working paper series$v7601
*7001 $aLevine, Phillip B.$_49384400
*7102 $aNational Bureau of Economic Research (Forente Stater)$_13074800
*830 0$aWorking paper series (National Bureau of Economic Research : trykt utg.)$x0898-2937$v7601$w999105437124702201$_13074900
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