Lawrence Dhliwayo, Florance Matarise and Charles Chimedza. Modelling Volatility and Level Shift in Fractionally Integrated Processes. NRAMCS-V1 [Internet]. 2022 Apr. 20 [cited 2026 Jun. 13];:118-37. Available from: https://stm.bookpi.org/NRAMCS-V1/article/view/6557