Chinhamu , Knowledge, Nompilo Mabaso, and Retius Chifurira. “Modelling Crude Oil Returns Using the NRIG Distribution”. Statistics, Optimization & Information Computing 9, no. 1 (December 24, 2020): 204-222. Accessed April 25, 2024. http://iapress.org/index.php/soic/article/view/1025.