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4. Gamma distribution fitting: NCSS Statistical Software.
https://ncss-wpengine.netdna-ssl.com/wp-content/themes/ncss/pdf/Procedures/NCSS/Gamma_Distribution_Fitting.pdf
. Accessed 17 Nov 2017
5. Akram, M., Hayat, A.: Comparison of Estimators of the Weibull Distribution. Financial Econometrics Series. Deakin University, Geelong (2013)