Wattanakul, T., and S. Nonthapot. “Analysis of Market Structure and Passenger Transportation Demand Model Between Thailand and Laos: Case Study of the Customs House, Friendship Bridge, Nong Khai Province”. Asia-Pacific Journal of Science and Technology, vol. 16, no. 3, Apr. 2017, pp. 292-05, https://so01.tci-thaijo.org/index.php/APST/article/view/83220.