@incollection{, 0E256AFB8D0364719CFBB6D8AB7D525E , author={{HazguiSamah} and {University of Manouba.}}, journal={{Global Journal of Management and Business Research}}, journal={{GJMBR}}2249-45880975-585310.34257/GJMBR, address={Cambridge, United States}, publisher={Global Journals Organisation}209110 } @incollection{b0, , title={{A Capital Asset Pricing Model with Time-Varying Covariances}} , author={{ TBollerslev } and { REngle } and { FWooldridge } and { J } and { M }} , journal={{Journal of political economy}} 96 1 , year={1988} } @incollection{b1, , title={{On the hedge and safe haven properties of Bitcoin: Is it really more than a diversifier?}} , author={{ EBouri } and { AzziP GMolnár } and { RoubaudDHagfors } and { .I }} , journal={{Finance Research Letters}} 20 , year={2017a} } @incollection{b2, , title={{Bitcoin for energy commodities before and after the December 2013 crash: diversifier, hedge or safe haven?}} , author={{ JalkhE NBouri } and { RoubaudPMolnár }} , journal={{Applied Economics}} , year={2017b} } @incollection{b3, , title={{Virtual currency, tangible return: Portfolio diversification with bitcoin}} , author={{ MBrière } and { KOosterlinck } and { Szafarz }} , journal={{Journal of Asset Management}} 16 , year={2015} } @incollection{b4, , title={{does gold glitter in the long-run? 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