Kitpracha, C., D. Promchot, P. Srestasathiern, and C. Satirapod. 2017. “Precise Tropospheric Delay Map of Thailand Using GNSS Precise Point Positioning Technique”. International Journal of Geoinformatics 13 (2). https://ijg.journals.publicknowledgeproject.org/index.php/journal/article/view/1031.