KETTUNEN, L. Maataloustuotannon ennakointi . Agricultural and Food Science, [S. l.], v. 46, n. 2, p. 125–131, 1974. DOI: 10.23986/afsci.71878. Disponível em: https://journal.fi/afs/article/view/71878. Acesso em: 23 may. 2024.