The millenium seemed to spur a lot of people to compile "Top 100" or "Best 100" lists of many things, including movies (by the American Film Institute) and books (by the Modern Library). Mathematicians were not immune, and at a mathematics conference in July, 1999, Paul and Jack Abad presented their list of "The Hundred Greatest Theorems." Their ranking is based on the following criteria: "the place the theorem holds in the literature, the quality of the proof, and the unexpectedness of the result."
S. Abachi. (1995)cite arxiv:hep-ex/9503003
Comment: postscript available at http://fnnews.fnal.gov/top_paper_dzero.ps,
for further info see http://fnnews.fnal.gov/top_discovery.html.
C. Abras, D. Maloney-Krichmar, and J. Preece. Bainbridge, W. Encyclopedia of Human-Computer Interaction. Thousand Oaks: Sage Publications, 37 (4):
445-456(2004)
S. Alioli, P. Nason, C. Oleari, and E. Re. (2009)cite arxiv:0907.4076
Comment: Figs. 10, 11 and 12 were obtained without the acceptance cuts
described in the text. They have been replaced with the correct ones.