Journal articles

The rate of growth in scientific publication and the decline in coverage provided by Science Citation Index.
Scientometrics, 84(3):575-603, 2010.
P O Larsen and M von Ins.
[doi]  [abstract]  [BibTeX] 
Co-citation in the scientific literature: A new measure of the relationship between two documents.
Journal of the American Society for Information Science, 24(4):265-269, 1973.
Henry Small.
[doi]  [abstract]  [BibTeX]