A. Ortiz-Ramírez, L. F. Leyva-Sosa, and M. T. V. Martínez-Palacios, “Investment portfolios with alternative risk measures: semi-equity and absolute mean deviation”, PE, vol. 15, no. 29, pp. 139–171, Dec. 2019, doi: 10.29201/peipn.v15i29.52.