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*24500$aAmerican options exercise boundary when the volatility changes randomly$cN. Touzi
*260  $aParis$bINSEE$c1995
*300  $a23 s.
*4901 $aSérie des documents de travail$vno 9551
*7001 $aTouzi, N$_14207900
*7102 $aFrankrike. Institut national de la statistique et des études économiques$_13356100
*830  $aSérie des documents de travail$vno 9551$w990212461304702201$_13356200
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^