Wattanakul, Thanet, and Sakkarin Nonthapot. 2017. “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 16 (3):292-305. https://so01.tci-thaijo.org/index.php/APST/article/view/83220.