Doyen, G., Drakova, D., Barth, J. V., Schuster, R., Gritsch, T., Behm, R. J., et al. (1993). Scanning-tunneling-microscope imaging of clean and alkali-metal-covered Cu(110) and Au(110)surfaces. Physical Review B, 48(3), 1738-1749. doi:10.1103/PhysRevB.48.1738.