1. N. Weste, and K. Eshraghian, Principles of CMOS VLSI Design, p. 141, Addison-Wesley, Reading, Mass., 1985.
2. R. S. Muller, and T.I. Kamins, Device Electronics for Integrated Circuits, p. 443, John Wiley, New York, 1986.
3. C. Mead, and L. Conway, Introduction to VLSI Systems, Addison-Wesley, Reading, Mass., 1980.
4. I. Ames, F. d’Heurle, and R. Hortsmann, IBM J. R and D
14, 461 (1970).
5. Tungsten and Other Refractory Metals for VLSI Applications, Vols. I to V, Materials Research Society, Pittsburgh, 1986, 1987, 1988, 1989 and 1990.