1. Arnone, J. A. (1988). “Photosynthesis, Carbon Allocation, and Nitrogen Fixation in Red Alder (Alnus rubra Bong.) Seedlings: Effects of Nodulation, CO2 Enrichment, and Substrate Nitrogen,” Ph.D. dissertation, 85 pp. Yale Univ., New Haven, Connecticut.
2. Assaying nitrogenase (C2H2) activity in the field;Balandreau;Bull. Ecol. Res. Comm., NFR,1973
3. Hydrogenase in actinorhizal root nodules and root nodule homogenates;Benson;J. Bacteriol,1980
4. “Methods for Evaluating Biological Nitrogen Fixation.”,1980
5. Natural abundance of nitrogen-15 as a tool for tracing alder-fixed nitrogen;Binkley;Soil Sci. Soc. Am. J.,1985