Perhaps you should try some spelling variations:
"mathematical and computational geophysics" » "mathematical and computational physics", "mathematical and computational astrophysics", "mathematical and computational biophysical"
"mathematical and computational biophysics" » "mathematical and computational physics", "mathematical and computational biomechanics", "mathematical and computational forensics"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("mathematical and computational geophysics") OR ("mathematical and computational biophysics")).
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