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.