Why and how to estimate the cost of symbiotic N2 fixation? A progressive approach based on the use of 14C and l5N isotopes

Warembourg, F. R., & Roumet, C. (1989). Why and how to estimate the cost of symbiotic N2 fixation? A progressive approach based on the use of 14C and l5N isotopes. In Ecology of Arable Land — Perspectives and Challenges (pp. 31–41). Springer Netherlands. https://doi.org/10.1007/978-94-009-1021-8_4