Shafqat, Muhammad, Sajid Ali, Ismail Shah, and Sanku Dey. “Univariate Discrete Nadarajah and Haghighi Distribution: Properties and Different Methods of Estimation”. Statistica 80, no. 3 (January 1, 2020): 301–330. Accessed October 27, 2021. https://rivista-statistica.unibo.it/article/view/9532.