Pumijumnong, N. ., and K. . Palakit. “Effects of Climate Variability on the Annual and Intra-Annual Ring Formation of Pinus Merkusii Growing in Central Thailand: DOI: 10.32526/Ennrj.18.3.2020.22”. Environment and Natural Resources Journal, vol. 18, no. 3, May 2020, pp. 234-48, https://ph02.tci-thaijo.org/index.php/ennrj/article/view/240942.