Generally speaking, there are three types of citations (Small 1997 ): direct citation, and the other two indirect citation, namely co-citation (Small 1973 ), and bibliographic coupling (Kessler 1963
Bibliometric technique of citation analysis was applied to the data of five psychological periodical literature. The distribution
of citations frequencies was statistically tested and the obsolescence factors were determined. The relation between the growth
and obsolescence has been studied, and it has been observed that “higher the growth of literature, higher the obsolescence
as well as higher the half life.”
The paper provides a picture of Mexican health sciences research for the years 1982–1986, measuring, bibliometrically, the size of its scientific activity. The most widely bibliometric indicators for research evaluation, publication count and citation analysis, are combined to determine the degree of production, productivity, and impact. The study also highlights the role of leading research institutions.
This study used citation analysis method to identify the 40 classics published in the Journal of the American Society for Information Science and Technology from 1956 to 2007. Yhe year and subject distributions of these classic references reflect the history and the current status
of information science.
. Diachronic citationanalysis is commonly used when calculating the cited half-life of a journal or a specific article (Egghe and Rousseau 1990 ). Such analyses are historical in the sense that one calculates the total amount of citations given annually to an