Ying-Hsiu's paper presented in APMC 2019, Singapore, Dec. 2019
Y.-H. Cho, F.-P. Lai and Y.-S. Chen, “Novel topologies of resonators for orientation-insensitive chipless radiofrequency identification,” 2019 Asia-Pacific Microwave Conference (APMC 2019), Singapore, Dec. 2019, pp. 1‒3.