Kaul, O. N., and P. B. L. Srivastava. “Nutrient Uptake of Fir (<I>Abies pindrow< I>) and Spruce (<I>Picea smithiana< I>)”. Indian Forester 93, no. 11 (November 1, 1967): 749–753. Accessed December 4, 2025. http://indianforester.co.in/index.php/indianforester/article/view/25724.