"Synthesis and field emission characteristics of carbon nanocoils with a high aspect ratio supported by copper micro-tips"

Woo Yong Sung, Jong G. Ok, Wal Jun Kim, Seung Min Lee, Soon Chang Yeon, Ho Young Lee, and Yong Hyup Kim , Nanotechnology , 18 (24), 245603 (Jun 2007)

"Uniformity enhancement of carbon nanofiber emitters via electrical discharge machining"

Jong G. Ok, Bo Hyun Kim, Woo Yong Sung, Chong Nam Chu, and Yong Hyup Kim , Applied Physics Letters , 90 (3), 033117 (Jan 2007)