Macedo, Anthony, João Rebelo, and Sofia Gouveia. “Export Propensity and Intensity in the Wine Industry: A Fractional Econometric Approach”. Bio-based and Applied Economics 8, no. 3 (November 9, 2020): 261-277. Accessed January 19, 2021. https://oaj.fupress.net/index.php/bae/article/view/9447.