1. G. D. Mahan, and J. O. Sofo,1234,Proc. Natl Acad. Sci. 93, 7436–7439 (1996).
2. CRC handbook of thermoelectrics(ed. D. M. Rowe) (CRC Press, Boca Raton, F1, 1995).
3. F. J. DiSalvo,Science 285, 703–706 (1999).
4. T. C. Harmon, and J. M. Honig,Thermoelectric and thermomagnetic effects and appli tions(McGraw Hill, New York, 1967).
5. N. W. Ashcroft, and N. D. Mermin,Solid State Physics(Holt, Rinehart, and Winston, 1976).