4 reasons why Google Scholar isn’t as great as you think it is

Is Google Scholar reliable/valuable?

(article in: Issues in Science and Technology Librarianship, Summer 2012) "...takes a look at reliability factors that go into Google Scholar citation counts, selection of resources, and its commercial partnerships...     ...led to the conclusion that Google Scholar may be useful for initial and supplemental information gathering, but lacks a deeper reliability than other existing services currently provide scholars."