Google Scholar”,

Google Scholar enables you to search specifically for scholarly literature, including peer-reviewed papers, theses, books, preprints, abstracts and technical reports from all broad areas of research.

検索対象が論文の類に限定されるので,文献探しをする時に不要なものがマッチしにくくて便利そう.今のところ,日本語での検索は駄目みたい…