Perhaps you should try some spelling variations:
"de guitar studies in mathematical physical" » "de guitar studies in mathematics physics", "de guitar studies in mathematical basics", "de guitar studies in mathematical statistical", "de gruyter studies in mathematical physical", "de lunar studies in mathematical physical", "de guided studies in mathematical physical", "_ guitar studies in mathematical physical", "5 guitar studies in mathematical physical", "1 guitar studies in mathematical physical"
"de gruiter studies in mathematical physics" » "de gruyter studies in mathematical physics", "de cluster studies in mathematical physics", "de river studies in mathematical physics", "de gruijter studies in mathematical physics", "de ruiter studies in mathematical physics"
"de guitar studies in mathematical physics" » "de gruyter studies in mathematical physics", "de lunar studies in mathematical physics", "de guided studies in mathematical physics", "_ guitar studies in mathematical physics", "5 guitar studies in mathematical physics", "1 guitar studies in mathematical physics"
"de wear studies in mathematical physics" » "de epr studies in mathematical physics", "de esr studies in mathematical physics", "de qsar studies in mathematical physics", "le wear studies in mathematical physics", "pe wear studies in mathematical physics", "we wear studies in mathematical physics"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("de guitar studies in mathematical physics") OR ("de guitar studies in mathematical physical"))) OR ("de gruiter studies in mathematical physics"))) OR ("de wear studies in mathematical physics")).
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• Removing quotes may allow a broader search: (((((( de guitar studies in mathematical physics ) OR ( de guitar studies in mathematical physical ))) or ( de gruiter studies in mathematical physics ))) or ( de wear studies in mathematical physics )).
• Adding a wildcard symbol may retrieve word variants: (((((("de guitar studies in mathematical physics") OR ("de guitar studies in mathematical physical"))) or ("de gruiter studies in mathematical physics"))) or ("de wear studies in mathematical physics"))*.