The 2008 Journal Citation Reports includes citation data from all conference proceedings regardless of publication type. With this release, proceedings published in books, book series, and journals all contribute citation data. In prior years, citations from proceedings published in books were not counted. However, proceedings published in journals and book series have always been counted.
Overall, the additional material accounts for an increase in total citations of approximately 2% (1.1 million citations added to a total of 47 million).
