1. Vaughan, D.C.: The generalized secant hyperbolic family and its properties. Commun. Stat. Theory Methods 31(2), 219–238 (2002)
2. Fischer, M., Vaughan, D.C.: Classes of skewed generalized hyperbolic secant distributions. Working Paper No. 45 (unpublished). Department of Statistics and Econometrics, FAU Erlangen-Nuremberg, Nuremberg (2002)
3. Fischer, M.: A skew generalized secant hyperbolic family. Austrian J. Stat. 35(4), 437–444 (2006)
4. Vaughan, D.C.: Modeling skewness and kurtosis with the S-EGSH. Working Paper (unpublished). Department of Mathematics, Wilfrid Laurier University, Waterloo (2011)
5. Perks, W.: On some experiments in the graduation of mortality statistics. J. Inst. Actuar. 63, 12–57 (1932)