Laaksonen, Kyösti. “The Effect of Climatic Factors on the Hectare Yields of Barley, Oats and Spring Wheat in Finland in 1972-77”. Fennia - International Journal of Geography 157, no. 2 (February 1, 1979): 199–221. Accessed May 22, 2024. https://fennia.journal.fi/article/view/9179.