A. E. Adeniji, A. N. Njah, and O. I. Olusola, “Regional and Seasonal Variation of Chaotic Features in Hourly Solar Radiation Based on Recurrence Quantification Analysis”, JAND, vol. 9, no. 2, pp. 175–187, Aug. 2026, doi: 10.5890/JAND.2020.06.002.