1. W. Jeffrey, L.D. David, W.L. Guthrie, J. Hopewell, F.B. Kaufman, W.J. Patrick, K.P. Rodbell, R.W. Pasco, and A. Nenadic, U.S. patent 4,954,142 (1990).
2. C. Kanta, W. Cote, J. Cronin, K. Holland, P.I. Lee, and T. Wright: Proc. 5th Int. IEEE VLSI Interconnection Conf. (Piscataway, NJ: IEEE, 1988), pp. 21–28.
3. J. Larsen-Basse and H. Liang, Wear 233–235, 647 (1999).
4. M. Holstetler, Investor Business Daily (Oct. 20, 1997).
5. R. Krause, Investor Business Daily A39 (Nov. 3, 1997).