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100   $a20090115d1992----km-y0itay50------ba
101 0 $aeng
102   $aUS
105   $a--------001yy
200 1 $aStructural holes$ethe social structure of competition$fRonald S. Burt
210   $aCambridge$cHarvard University Press$d1992
215   $aVIII, 313 p.$d23 cm
700  1$aBurt,$bRonald S.$0118943
801  0$aIT$bUNINA$gRICA$2UNIMARC
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