Pokhriyal, T. C., Chaukiyal, S. P. and Himmat Singh, K. C. . (1996) “Nitrogen Fixation and Nodulation Behaviour in Relation to Seasonal Changes in Six Multipurpose Tree Species”, Indian Forester, 122(8), pp. 718–726. doi: 10.36808/if/1996/v122i8/6425.