Yi, J., K. Dong, S. Shen, Y. Jiang, X. Peng, C. Ye, and Z. L. Wang. “Fully Fabric-Based Triboelectric Nanogenerators As Self-Powered Human–Machine Interactive Keyboards”. Nano-Micro Letters, vol. 13, Apr. 2021, p. 103, doi:10.1007/s40820-021-00621-7.