A Study of Reflective Efficiency of Cold Plastic Pavement Marking on Concrete Pavement
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 Thai Industrial Standards, Glass Bead for Road Marking Standard TIS 543-2550, Bangkok: Ministry of Industry, 2007. (in Thai)
 K. Vanichbuncha, "SPSS for Windows Data Analysis," Chulalongkorn University, Bangkok, 2003. (in Thai)
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