Perhaps you should try some spelling variations:
"boundary revisited network" » "bounding revisited network", "boundary assisted network", "body revisited network", "boundary revisited work", "boundary revisiting networks", "boundary envisioned network"
"boundary fitted network" » "boundary finite network", "boundary fixed network", "boundary fitting network", "boundary twisted network"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("boundary revisited network") OR ("boundary fitted network")).
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