Dr. Thirachaya Chaigasem, Amarawadee Kumboon. (2020). Frontier Tourism in the pattern of Twin Cities located in Thailand and Lao People’s Democratic Republic on Structural Model . PalArch’s Journal of Archaeology of Egypt / Egyptology, 17(9), 5416 - 5433. Retrieved from https://www.archives.palarch.nl/index.php/jae/article/view/5012