Ludidi, N. N., Pellny, T. K., Kiddle, G., Dutilleul, C., Groten, K., Heerden, V. D., et al. (2007).
Genetic variation in pea (Pisum sativum L.) demonstrates the importance of root but not shoot C/N ratios in the control of
plant morphology and reveals a unique relationship between shoot length and nodulation intensity.
Plant, Cell and Environment, 30(10), 1256-1268. doi:10.1111/j.1365-3040.2007.01699.x.