Krause, K., Providoli, I., Currie, W. S., Bugmann, H., & Schleppi, P. (2012). Long-term tracing of whole catchment 15N additions in a mountain spruce forest: measurements and simulations with the TRACE model. Trees: Structure and Function, 26(6), 1683-1702. https://doi.org/10.1007/s00468-012-0737-0