Hamedani, G., M. Najaf, A. Roshani, and N. S. Butt. “Characterizations of Twenty (2020-2021) Proposed Discrete Distributions”. Pakistan Journal of Statistics and Operation Research, Vol. 17, no. 4, Dec. 2021, pp. 847-84, doi:10.18187/pjsor.v17i4.3902.