Effective temperature sums and durations of the vegetative period in Fennoscandia (1921-1950) ; The effect of climatic factors on the hectare yields of barley, oats and spring wheat in Finland in 1972-77 - Laaksonen, Kyösti ([Helsingin yliopisto], 1979)
Sarjalla myös lat. nimeke.
Erip. Fennia ; 157, 2.