Steltenpohl, A., & Memmel, N. (2000). Self-Diffusion on Pd(111). Surface Science, 454-456, 558-561. Retrieved from http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TVX-40CS04F-3R-9&_cdi=5546&_user=100196&_orig=browse&_coverDate=05%2F20%2F2000&_sk=995439999&view=c&wchp=dGLbVzb-zSkWW&md5=32a79c48387c08f13c192dd587799ead&ie=/sdarticle.pdf.