Team, S. “Event Index Computation for Forecasting Case Study: Car Sales in Thailand: Witchaya Rattanametawee, Chartchai Leenawong”. Thai Journal of Mathematics, vol. 18, no. 4, Dec. 2020, pp. 2079–2091, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/1126.