P. A. Fleury and K. B. Lyons

Phys. Rev. Lett. 37, 1088 (1976)

G. A. Baraff and M. Schlüter

Phys. Rev. Lett. 56, 1214 (1986)

Jerry Waldman, David M. Larsen, Peter E. Tannenwald, C. C. Bradley, Daniel R. Cohn, and Benjamin Lax

Phys. Rev. Lett. 23, 1033 (1969)