Difference-in-differences econometric assessment of mobile extension services on productivity growth and technical change patterns. Journal of Agriculture, Forestry and Fisheries, [S. l.], v. 22, n. 2, p. 6–15, 2025. Disponível em: https://jaff.net.ng/index.php/Journal/article/view/30. Acesso em: 17 apr. 2026.