Kengpol, A., T. Pichitkarnkar, and K. Elfvengren. “A Decision Support System for Consumer Behavior of Chinese In-Bound Tourists on Functional Beverage: An Empirical Study During COVID-19 With Thailand Sandbox”. Applied Science and Engineering Progress, vol. 15, no. 1, Oct. 2021, doi:10.14416/j.asep.2021.09.001.