Khompratya, T., and P. Klungboonkrong. “Development of the decision support tool for analyzing black spot locations in road network using geographic information system: Khon Kaen University case study (Thai)”. Asia-Pacific Journal of Science and Technology, vol. 14, no. 2, Apr. 2017, pp. 181-9, https://so01.tci-thaijo.org/index.php/APST/article/view/83364.