Google Scholar is a large and free multidisciplinary search engine for scientific articles (and to a lesser extent books). Important characteristics are the full text searchability of the articles and that the search engine is filled almost entirely automatically.
Compared to other article search engines, Google Scholar is a strong tool for finding:
Your search results may contain:
There are several ways to get access to the full text:
The easiest option: above the description
If that does not help, in the right hand column:
As last option, below the description:
If Google can offer a direct [PDF], [DOC] or [HTML] link to the full text it sometimes does not show the UBU-link at all.
Many searches give you predominantly papers that are 5-20 years old. This is caused by the hybrid ranking Google employs to sort the results, taking into account the number of times a paper was cited. Newer papers have had less time to accrue citations to them. To see the new papers, use the year filter options from the Google Scholar menu on the left of the screen.