B. Kumar Gupta, Kedawat, G., Kumar, P., Singh, S., Suryawanshi, S. R., Agrawal, N., Gupta, G., Kim, A. Ra, Gupta, R. K., More, M. A., Late, D. J., and Hahm, M. Gwan, ?Field emission properties of highly ordered low-aspect ratio carbon nanocup arrays?, RSC Advances, vol. 6, no. 12, pp. 9932-9939, 2016.