Chatlatanagulchai, W. ., . S. . Chotana, and C. . Prutthapong. “Direct Adaptive Input Shaping Using On-Line Frequency Domain Information and Extremum-Seeking Optimization”. Agriculture and Natural Resources, vol. 49, no. 4, Aug. 2015, pp. 626-38, https://li01.tci-thaijo.org/index.php/anres/article/view/243707.