Pei, Z., H. Hu, G. Liang, and C. Ye. “Carbon-Based Flexible and All-Solid-State Micro-Supercapacitors Fabricated by Inkjet Printing With Enhanced Performance”. Nano-Micro Letters, vol. 9, no. 2, Dec. 2016, p. 19, doi:10.1007/s40820-016-0119-z.