Byung Yong Choi, Byung-Gook Park, Jong Duk Lee, Hyungcheol Shin, Yong Kyu Lee, Suk-Kang Sung, Se-Hoon Lee, Heesoon Chae, Jong Jin Lee, Keun Hee Bai, Dong-Dae Kim, Dong-Won Kim, Choong-Ho Lee, and Donggun Park, “TWIn SONOS TransistOR (TWISTOR) for 2-bit/cell SONOS Memory Technology,” IEEE Non-Volatile Semiconductor Memory Workshop, California, U.S.A., pp. 72-73, Feb. 12-16, 2006