Heilmeier, H., Freund, M., Steinlein, T., Schulze, E. D., & Monson, R. K. (1994).
The influence of nitrogen availability on carbon and nitrogen storage in the biennial Cirsium vulgare (Savi) Ten. I. Storage
capacity on relation to resource acquisition, allocation and recycling. Plant, Cell and Environment,
17(10), 1125-1131. doi:10.1111/j.1365-3040.1994.tb02010.x.