https://doi.org/10.1111/j.1461-0248.2009.01352.x
Maire, V., Gross, N., Pontes, L., Picon-Cochard C., & Jean-François S.,
(2009). Trade-off between root nitrogen acquisition and shoot nitrogen
utilization across 13 co-occurring pasture grass species.Functional Ecology , 23 , 668-679.