Memory characteristics of double layer NiSi2 nanocrystals for nano-floating gate memory, Sung-Jin Choi, Seong-Goo Ahn, Jun-Hyuk Lee, Dong-Hyoun Kim, Seul-ki Oh, Wangyu Song, Seon-Jun Choi, and Seung-Beck Lee, PNE045, August 27, 2009, KINTEX, Goyang, Korea