In the SPIRES database we use the following terminology: if paper B includes an earlier paper A in its "reference" list, then paper A is "cited by" paper B, http://www.slac.stanford.edu/spires/hep/references.html
The SPIRES team produces a yearly list of the topcited papers (for that year, and all-time), with a beautiful review written by SLAC's Michael Peskin. http://www.slac.stanford.edu/library/topcites 
L. Addis, "SLAC Library monitors underground Physics Press," SLAC News (June 1971). 
Deutsches Elektronen Synchrotron (DESY), http://www.desy.de
Stanford Linear Accelerator Center (SLAC), http://www.slac.stanford.edu/
H. Galic, "Guide to QSPIRES and the particle databases on SLACVM", SLAC-0393, http://www.slac.stanford.edu/spires/find/hep/www?r=slac-0393
P. A. Kreitz, L. Addis and A. S. Johnson, "The Virtual library in action: Collaborative international control of high-energy physics preprints", Presented at Grey Exploitations in the 21st Century: The Second International Conference on Grey Literature, Washington, D.C., 2-3 Nov, 1995; http://www.slac.stanford.edu/spires/find/hep/www?r=slac-pub-7110
L. Addis, H. Galic, P. Kreitz and A. Johnson, "The Virtual library in action", Presented at 209th American Chemical Society National Meeting, Anaheim, CA, 2-6 Apr 1995, http://www.slac.stanford.edu/spires/find/hep/www?r=slac-pub-8185
D. E. Knuth, "The TEX book", Addison Wesley 1986. 
J. Maldacena, "The large N limit of superconformal field theories and supergravity", Adv. Theor. Math. Phys. 2, 231 (1998) [hep-th/9711200], http://www.slac.stanford.edu/spires/find/hep/www?eprint=HEP-TH/9711200
T. Berners-Lee, "Weaving the Web", (Harper, 1999). An interesting account of the development of SLAC's web server can be found in Louise Addis' First Monday interview http://www.firstmonday.dk/issues/issue5_5/addis/ 
J. M. Deken, "First in the web, but where are the pieces?" SLAC-PUB-7636. http://www.slac.stanford.edu/spires/find/hep/www?r=slac-pub-7636 
Much of the work for this linking was done by the former HEP database manager, Hrvoje "Harv" Galic. A good account of the adoption of new technologies to enhance the database can be found at http://www.slac.stanford.edu/spires/spires_news.html 
H. Van de Sompel and P. Hochstenbach, "Reference linking in a hybrid library environment", D-Lib Magazine 5 no. 4 and D-Lib Magazine 5 no. 10.