Perhaps you should try some spelling variations:
"de guitar studies in mathematical physics" » "de guided studies in mathematical physics", "de guin studies in mathematical physics", "de guitar study in mathematical physics", "de gruiter studies in mathematical physics", "_ guitar studies in mathematical physics", "5 guitar studies in mathematical physics", "de guitar studies in mathematical physical"
"de lunar studies in mathematical physics" » "de qsar studies in mathematical physics", "de radar studies in mathematical physics", "de wear studies in mathematical physics", "de luna studies in mathematical physics", "e lunar studies in mathematical physics", "day lunar studies in mathematical physics", "de lunar studies in mathematical physical"

Try widening your search to All Fields.

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

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