STRØMGAARD, P. Hans Ruthenberg: Innovation policy for small farmers in the tropics: the economics of technical innovations for agricultural development. Ed. by Hans E. Jahnke. Geografisk Tidsskrift, [S. l.], v. 87, 1987. Disponível em: https://tidsskrift.dk/geografisktidsskrift/article/view/44457. Acesso em: 29 mar. 2024.