Forecasting the South African tax-to-GDP ratio series utilizing seasonal autoregressive integrated moving average and artificial neural networks models . The Economics and Finance Letters, [S. l.], v. 12, n. 3, p. 534–544, 2025. DOI: 10.18488/29.v12i3.4416. Disponível em: https://archive.conscientiabeam.com/index.php/29/article/view/4416. Acesso em: 7 aug. 2026.