scholarly article by Gianluca Tramontana et al published 29 July 2016 in Biogeosciences
author: Lutz Merbold, Markus Reichstein, Sebastian Wolf, Dario Papale, Gustau Camps-Valls, Kazuhito Ichii, Christopher R Schwalm, Gianluca Tramontana, Martin Jung, Alessandro Cescatti, Muhammad Altaf Arain, Gerard Kiely, Botond Ráduly, Penélope Serrano-Ortiz