In researching for a report, an assignment, your exjobb, master thesis, a scientific paper, etc it is essential to check the available literature or state-of-the-art. For that reason you need specialized tools instead of the regular, off-the-shelf, search engines. The reason is that search engines will drown you with noise. That is, pages upon pages where the query terms appear but are not authoritative information sources.

For that reason I will provide some scientific portals and search engineers that index scientific content in mathematics and computer science.