(1)
J. Caro, P. A. M. Holweg, A. H. Verbruggen, J.A. Kokkedee, and S. Radelaar, Metallic point contacts realized by nanofabrication techniques, Low Temp. Phys. 18, (1992) [Fiz. Nizk. Temp. 18, 489-493, (1992)].