Nitrogen and Phosphorus Effect on Sun-Induced Fluorescence and Gross Primary Productivity in Mediterranean Grassland oleh David Martini, Javier Pacheco-Labrador, Oscar Perez-Priego, Christiaan van der Tol, Tarek S. El-Madany, Tommaso Julitta, Micol Rossini, Markus Reichstein, Rune Christiansen, Uwe Rascher, Gerardo Moreno, M. Pilar Martín, Peiqi Yang, Arnaud Carrara, Jinhong Guan, Rosario González-Cascón, Mirco Migliavacca