Darti, Isnani, Agus Suryanto, Hasan S. Panigoro, and Hadi Susanto. 2021. “Forecasting COVID-19 Epidemic in Spain and Italy Using A Generalized Richards Model With Quantified Uncertainty”. Communication in Biomathematical Sciences 3 (2):90-100. https://doi.org/10.5614/cbms.2020.3.2.1.