1. L. Guo, E. Leobanding, and S. Y. Chon, Appl. Phys. Lett. 70, 850 (1997).
2. T. Sakamoto, H. Kawaura, and T. Baba, Appl. Phys. Lett. 72, 795 (1998).
3. P. A. Cain and H. Ahmed, Appl. Phys. Lett. 78, 3624 (2001).
4. A. I. Yakimov, A. V. Dvurechenskii, and A. I. Nikiforov, in Handbook of Semiconductor Nanostructures and Nanodevices, Ed. by A. A. Balandin and K. L. Wang (Am. Sci., Stevenson Ranch, Calif., 2005), Vol. 10, p. 1.
5. D. V. Averin and K. K. Likharev, in Mesoscopic Phenomena in Solids, Ed. by B. L. Altshuler, P. A. Lee, and R. A. Webb (Elsevier, New York, 1999), p. 173.