Pokhriyal, T. C., S. P. Chaukiyal, and H. B. Naithani. 1993. “Nitrogen Fixation and Nodulation Behaviour of Some Nitrogen Fixing Species from Inner and Outer Himalaya”. Indian Forester 119 (4):310-20. https://doi.org/10.36808/if/1993/v119i4/8018.