Maimoona, Alya, et al. “Comparison of Radical Scavenging Capacity of Different Extracts of Barks and Needles of Pinus Roxburghii and Pinus Wallichiana”. Asian Journal of Chemistry, vol. 23, no. 2, Oct. 2010, pp. 819-22, https://asianpubs.org/index.php/ajchem/article/view/15862.