@incollection{, 45EEFED06F2D364CA1CFE4EEE0A7ACC2 , author={{Ndeumen AngeleGhislaine} and {KamdemDavid} and {AvomDesire} and {Université de Dschang, Cameroun.}}, journal={{Global Journal of Management and Business Research}}, journal={{GJMBR}}2249-45880975-585310.34257/GJMBR, address={Cambridge, United States}, publisher={Global Journals Organisation}197110 } @incollection{b0, , author={{ DAvramov } and { TChordia } and { AEtgoyal }} , booktitle={{The impact of trades on daily Volatility}} , year={2006} 19 } @incollection{b1, , title={{« Studies of Stock Price Volatility Changes}} , author={{ FBlack }} , booktitle={{Proceedings of the 1976 Meetings of the American Statistical Association », Business and Economical Statistics section}} the 1976 Meetings of the American Statistical Association », Business and Economical Statistics section , year={1976} } @incollection{b2, , title={{«The pricing of commodity contracts}} , author={{ FBlack }} , journal={{Journal of Financial Economics}} 3 1 , year={1976} } @incollection{b3, , title={{«The Pricing of Options and Corporate Liabilities»}} , author={{ FBlack } and { MScholes }} , journal={{Journal of Political Economy}} 81 3 , year={1973} } @incollection{b4, , title={{«Asymmetric volatility and risk in equity markets}} , author={{ GBekaert } and { GWu }} , journal={{Review of Financial Studies}} 13 , year={2000} } @incollection{b5, , author={{ TBollerslev }} , booktitle={{Generalized Autoregressive Conditional Heteroskedasticity}} , year={1986} 31 } @incollection{b6, , author={{ CE VBorio } and { RNMccauley }} , booktitle={{The economics of recent bond yield volatility}} , year={1996} 45 } @incollection{b7, , title={{« Is the crisis problem growing more severe?}} , author={{ MBordo } and { DB. 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