Jämbäck, Jari, Olavi Heikkinen, Mervi Tuovinen, and Jyrki Autio. “The Effect of Air-Borne Pollutants on the Growth of Pinus Sylvestris in the City of Oulu, Finland”. Fennia - International Journal of Geography 177, no. 2 (February 1, 1999): 161–169. Accessed November 23, 2024. https://fennia.journal.fi/article/view/8941.