Perhaps you should try some spelling variations:
"de guitar studies in mathematical physics" » "de gruyter studies in mathematical physics", "de lunar studies in mathematical physics", "de guided studies in mathematical physics", "de gruiter studies in mathematical physics", "1 guitar studies in mathematical physics", "2 guitar studies in mathematical physics", "de guitar studies in mathematical physical"
"_ guitar studies in mathematical physics" » "_ gruyter studies in mathematical physics", "_ lunar studies in mathematical physics", "_ guided studies in mathematical physics", "_ guitar studies in mathematical physical"
"5 guitar studies in mathematical physics" » "5 gruyter studies in mathematical physics", "5 lunar studies in mathematical physics", "5 guided studies in mathematical physics", "5 guitar studies in mathematical physical"

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: (((("de guitar studies in mathematical physics") OR ("_ guitar studies in mathematical physics"))) OR ("5 guitar studies in mathematical physics")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"de guitar studies in mathematical physics\") OR (\"_ guitar studies in mathematical physics\"))) or (\"5 guitar studies in mathematical physics\"))".
• Removing quotes may allow a broader search: (((( de guitar studies in mathematical physics ) OR ( _ guitar studies in mathematical physics ))) or ( 5 guitar studies in mathematical physics )).
• Adding a wildcard symbol may retrieve word variants: (((("de guitar studies in mathematical physics") OR ("_ guitar studies in mathematical physics"))) or ("5 guitar studies in mathematical physics"))*.