Puangsun, S., and K. Patanarapeelert*. “An SIR Epidemic Model with Gravity in Patchy Environment: Analyses for Two Patches System”. CURRENT APPLIED SCIENCE AND TECHNOLOGY, vol. 12, no. 2, Mar. 2018, pp. 127-33, https://li01.tci-thaijo.org/index.php/cast/article/view/135748.