Chaudhari, D.C. et al. 1991. Boosting Resin Production with 20% (Volumetric) Acid Mixture Stimulant from Chir Pine (<I>Pinus roxburghii</I> Sargent). Indian Forester. 117, 1 (Jan. 1991), 37–43. DOI:https://doi.org/10.36808/if/1991/v117i1/8560.