Example 2 - Search using more than one field 
If more than one field is used, they are connected by inter-field boolean operators (AND, OR or NOT). By default the fields are automatically connected by AND. Use AND if you want to narrow the query; if you want to expand the query use the OR operator.
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For instance, if you are interested in the publications written by Brown  and Smith (as co-authors)  in the years 1994 -1996 in English, you can specify as follows:

 
(...)
Personal Author 
(...)
AND OR NOT
Language
(...)
AND OR NOT 
Year, e.g. 1981;1982 

To connect terms with the Boolean operators AND or OR between two or more fields you have to select the Boolean operator located above the field. The system will interpret the request as seeking records  published in 1994, 1995 or 1996, co-authored by Brown and Smith.