Mai Noipitak และ Boonhlua Khwansri. (2016) Improvement of acoustoelastic coefficient for residual stress measurement by ultrasonic in low carbon steel. <i>KKU Engineering Journal</i>, <i>43</i>(S2), 263-266.Mai Noipitak และ Boonhlua Khwansri. "Improvement of acoustoelastic coefficient for residual stress measurement by ultrasonic in low carbon steel". KKU Engineering Journal 43 (2016):263-266.Mai Noipitak และ Boonhlua Khwansri. Improvement of acoustoelastic coefficient for residual stress measurement by ultrasonic in low carbon steel. Faculty of Engineering, Khon Kaen University:ม.ป.ท. 2016.