Klathae , Tawich, Napadon Sornpakdee, Chayanut Buathongkhue, and Naruapol Deedard. 2020. “Utilization of Parawood Ash in Concrete Paving Blocks”. Rajamangala University of Technology Srivijaya Research Journal 12 (1):36-48. https://li01.tci-thaijo.org/index.php/rmutsvrj/article/view/241931.