Jämbäck, J., Heikkinen, O., Tuovinen, M., & Autio, J. (1999). The effect of air-borne pollutants on the growth of Pinus sylvestris in the City of Oulu, Finland. Fennia - International Journal of Geography, 177(2), 161–169. Retrieved from https://fennia.journal.fi/article/view/8941