Tang, Y.H., Li, X.C., Li, J.L., Lin, L.W., Xu, H.F. and Huang, B.Y. 2010. Experimental evidence for the formation mechanism of metallic catalyst-free carbon nanotubes. Nano-Micro Letters. 2, 1 (Feb. 2010), 18-21. DOI:https://doi.org/10.1007/BF03353611.