1. R. B. Laibowitz and J. J. Cuomo, J. Appl. Phys. 41, 2749 (1970).JAPIAU0021-8979
2. R. F. Broom, R. Jaggi, R. B. Laibowitz, and W. Walter, Proceedings LT14, edited by M. Krusius and M. Vuorio (North‐Holland, Amsterdam, 1975), Vol. 4, p. 172.
3. V. Ambegaokar and A. Baratoff, Phys. Rev. Lett. 10, 486 (1963); PRLTAO0031-9007
4. V. Ambegaokar and A. Baratoff, Errata: Phys. Rev. Lett. 11, 104 (1963).PRLTAO0031-9007
5. C. B. Duke, in Tunneling Phenomena in Solids, edited by E. Burstein and S. Lundquist (Plenum, New York, 1969), p. 45.