Limiting your search by Content Type allows you to look for the kind of publication that is most likely to contain the information you need. By default, when searching for articles, only "Journal Articles" content type is selected.
Since words can be ambiguous, the subject terms are good for conceptualizing your search or further narrowing your topic.
Click the more... link to see the full list of subject options.
Slide the arrows on the graph to choose a range of years, or fill in a date range using the boxes below the graph. Click Update to apply your changes.
Most of the material on Summon is in English, but this option may help if you are looking for material in another language.
Click the more... link to see the full list of language options.