Bhatnagar, H. P., and K. K. Talwar. “Studies on the Effect of Growth Regulators on Growth and Tracheid Characters of <I>Pinus caribaea< I> Seedlings”. Indian Forester, vol. 104, no. 5, May 1978, pp. 333-54, doi:10.36808/if/1978/v104i5/11465.