Perhaps you should try some spelling variations:
references connections » references collections, reference conventions, reference collections
shear references » shells references, water references, layer references
ear references » earth references, air references, nmr references
r references » other references, water references

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((ear references) OR (shear references)) collections ) OR ( r references connections )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((ear references) OR (shear references)) collections ) or ( r references connections ))".
• Adding a wildcard symbol may retrieve word variants: (( ((ear references) OR (shear references)) collections ) or ( r references connections ))*.