Bharti, et al. “Temporal Stability Analysis of Resin Yield of Natural Regenerated Chir Pine (<I>Pinus roxburghii< I> Sargent) in Himachal Pradesh”. Indian Forester, vol. 142, no. 4, Apr. 2016, pp. 374-8, doi:10.36808/if/2016/v142i4/92322.