Perhaps you should try some spelling variations:
integral extensions » central extensions
information a » information age
array sharing » arrays bearing, way sharing, array arcing
array imaging » arrays imaging, airway imaging, ray imaging
array string » array strong, arrays strings, array forming
a integral » a integrale, _ integral, 5 integral

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: information a integral extensions ((((array sharing) or (array string))) or (array imaging))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information a integral extensions ((((array sharing) OR (array string))) OR (array imaging)).
• Adding a wildcard symbol may retrieve word variants: information a integral extensions ((((array sharing) or (array string))) or (array imaging))*.