Link: SCIRUS

About: SCIRUS is the most comprehensive science-specific search engine on the Internet. Driven by the latest search engine technology, Scirus searches over 370 million science-specific Web pages, enabling you to quickly: pinpoint scientific, scholarly, technical and medical data on the Web, find the latest reports, peer-reviewed articles, patents, pre prints and journals that other search engines miss, and offer unique functionalities designed for scientists and researchers. Indexing only.

Dates of Coverage: varies.

Truncation: [*]. (To use truncation, enter the root of a search term and replace the ending with a truncation symbol. The search engine will then find all forms of that word. For example, type comput* to find the words computer or computing).

Wildcard: [?]. (The wildcard helps when the spelling of a word is incomplete. To use the wildcard, enter your search terms and replace each unknown character with the appropriate wildcard symbol. The search engine finds all citations of that word with the symbol replaced by a letter. For example, type ne?t to find all citations containing neat, nest or next).