Yousof, H. M., A. Z. Afify, A. E. H. N. Ebraheim, G. G. Hamedani, and N. S. Butt. “On Six-Parameter Frechet Distribution: Properties and Applications”. Pakistan Journal of Statistics and Operation Research, Vol. 12, no. 2, June 2016, pp. 281-99, doi:10.18187/pjsor.v12i2.1327.