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Error parsing your query:
refs:(NOT)

You might try to enclose your search term in quotes:
" refs:(NOT)"

or read the Help on query language(eventually escape special characters with \)

Error message from parser:
Cannot parse ' refs:(NOT)': Encountered ")" at line 1, column 10.
Was expecting one of:
"(" ...
"*" ...
<QUOTED> ...
<TERM> ...
<PREFIXTERM> ...
<WILDTERM> ...
"[" ...
"{" ...
<NUMBER> ...