Wieser, G., Häsler, R., Götz, B., Koch, W., & Havranek, W. M. (2000). Role of climate, crown position, tree age and altitude in calculated ozone flux into needles of Picea abies and Pinus cembra: a synthesis. Environmental Pollution, 109(3), 415-422. https://doi.org/10.1016/S0269-7491(00)00044-0