Su, D., Y. Pei, L. Liu, Z. Liu, J. Liu, M. Yang, J. Wen, J. Dai, H. Deng, and G. Cao. “Wire-in-Wire TiO2/C Nanofibers Free-Standing Anodes for Li-Ion and K-Ion Batteries With Long Cycling Stability and High Capacity”. Nano-Micro Letters, vol. 13, Apr. 2021, p. 107, doi:10.1007/s40820-021-00632-4.