Poonnayom, Pramot, Voraya Wattanajitsiri, Surat Triwanapong, and Kittipong Kimapong. 2019. “Comparative Study of Mechanical Properties and Production Cost for Palm Cutting Blade Materials Selection”. Frontiers in Engineering Innovation Research 17 (1):65-76. https://ph01.tci-thaijo.org/index.php/jermutt/article/view/241930.