Venegas, O., A. I. Sanhueza, and H. W. Gómez. “An Extension of the Skew-Generalized Normal Distribution and Its Derivation”. Proyecciones (Antofagasta, On Line), vol. 30, no. 3, Dec. 2011, pp. 401-13, doi:10.4067/S0716-09172011000300007.