Perhaps you should try some spelling variations:
"certified network approximation algorithm" » "certified network approximation algorithms", "verified network approximation algorithm"
"modified adaptive quantization algorithm" » "modified adaptive estimation algorithm", "modified adaptive ventilation algorithm", "modified passive quantization algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"certified network approximation algorithm\") OR (\"modified adaptive quantization algorithm\"))~".
• Removing quotes may allow a broader search: (( certified network approximation algorithm ) OR ( modified adaptive quantization algorithm ))~.
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