1. S.H. Lee, H.F. Luan, W.P. Bai, C.H. Lee, T.S. Jeon, Y. Senaki, D. Roberts, D.L. Kwong, IEDM Tech. Dig., p. 31, San Francisco, (December 2000)
2. L. Kang, K. Onishi, Y. Jeon, B.H. Lee, C. Kang, W.-J. Qi, R. Nieh, S. Gopalan, R. Choi, J.C. Lee, IEDM Tech. Dig., p.35, San Francisco, (December 2000)
3. G.D. Wilk, R.M. Wallace, J.M. Anthony, J. Appl. Phys. 89(10), 5243 (2001)
4. M.T. Bohr, R.S. Chau, T. Ghani, K. Mistry, IEEE Spectrum, p. 23 (October 2007)
5. J.G. Simmons, J. Appl. Phys. 34(6), 1793 (1963)