Nakaruk, Auppatham, Thotsaphon Threrujirapapong, Daungdao Channei, and Wilawan Khanitchaidecha. 2015. “A Potential of Vetiver Grass for Feldspar Replacement in Ceramic Processing”. Naresuan University Engineering Journal 10 (2). Phitsanulok, Thailand:43-45. https://doi.org/10.14456/nuej.2015.10.