Ruffel, S., Krouk, G., Ristova, D., Shasha, D., Birnbaum, K. D., & Coruzzi, G. M. (2011). Nitrogen economics of root foraging: Transitive closure of the nitrate–cytokinin relay and distinct systemic signaling for N supply vs. demand. National Academy of Sciences.

Ruffel, Sandrine, Gabriel Krouk, Daniela Ristova, Dennis Shasha, Kenneth D. Birnbaum, and Gloria M. Coruzzi. Nitrogen Economics of Root Foraging: Transitive Closure of the Nitrate–cytokinin Relay and Distinct Systemic Signaling for N Supply Vs. Demand. National Academy of Sciences, 2011.

Ruffel, Sandrine, et al. Nitrogen Economics of Root Foraging: Transitive Closure of the Nitrate–cytokinin Relay and Distinct Systemic Signaling for N Supply Vs. Demand. National Academy of Sciences, 2011.