LAAKSONEN, K. Effective temperature sums and durations of the vegetative period in Fennoscandia (1921-1950). Fennia - International Journal of Geography, [S. l.], v. 157, n. 2, p. 171–197, 1979. Disponível em: https://fennia.journal.fi/article/view/9169. Acesso em: 4 may. 2024.