Lawrence DHLIWAYO; Florance MATARISE; Charles CHIMEDZA. Modelling Seasonal Volatility and Level Shift in Fractionally Integrated Processes . Research Highlights in Mathematics and Computer Science Vol. 2, [S. l.], p. 116–142, 2022. DOI: 10.9734/bpi/rhmcs/v2/2967C. Disponível em: https://stm.bookpi.org/RHMCS-V2/article/view/8659. Acesso em: 13 jun. 2026.