De Luca, Giovanni, Giampiero Gallo, and Danilo Carità. “Evaluating Combined Forecasts for Realized Volatility Using Asymmetric Loss Functions”. Econometric Research in Finance 2, no. 2 (January 5, 2018): 99 - 111. Accessed May 24, 2019. https://erfin.org/journal/index.php/erfin/article/view/18.