Lawrence Dhliwayo, Florance Matarise and Charles Chimedza. Modelling Seasonal Volatility and Level Shift in Fractionally Integrated Processes . RHMCS-V2 [Internet]. 2022 Oct. 31 [cited 2026 Jun. 13];:116-42. Available from: https://stm.bookpi.org/RHMCS-V2/article/view/8659