Vitousek, Peter, Lars Hedin, Pamela Matson, James Fownes, and Jason Neff. 1998. “Within-System Element Cycles, Input-Output Budgets, and Nutrient Limitation”. In Successes, Limitations, and Frontiers in Ecosystem Science, 432–451. Springer. Referenced from link.springer.com: Within-system element cycles, input-output budgets, and nutrient limitation.