Dirk Lewandowski has self-archived "Google Scholar as a Tool for Discovering Journal Articles in Library and Information Science."
Here's an excerpt:
We found that only some journals are completely indexed by Google Scholar, that the ratio of versions available depends on the type of publisher, and that availability varies a lot from journal to journal. Google Scholar cannot substitute for abstracting and indexing services in that it does not cover the complete literature of the field. However, it can be used in many cases to easily find available full texts of articles already found using another tool.
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