Kashi, Mansour, Hosseyni, S. Hassan, niyazkhani, A. Sadat, Abdollahi, S. Amin. “VaR modeling and back testing of short and long positions according to in Sample and out of Sample: application of family models Fractionally Integrated GARCH.” Financial Engineering and Portfolio Management, vol. 7, no. 29, 2016, pp. 1-24.