Bibliometrics are measures of an author's influence or impact. Citation analysis is an area of bibliometrics research in which citations in scholarly articles are used to establish relationships between authors or articles.
Two commonly used bibliometrics are impact factor and h-index. See the link on the left of this page (white paper from Thomson Reuters) for more information about how these metrics are used. See the links on the Resources page for information on how to look up/calculate numerical values for these and other metrics.
MESUR: MEtrics from Scholarly Usage of Resources
STAR METRICS - Science and Technology for America's Reinvestment: Measuring the Effect of Research on Innovation, Competitiveness, and Science