Perhaps you should try some spelling variations:
"modified passive estimation algorithms" » "modified passive estimation algorithm", "modified passive optimization algorithms", "modified passive optimisation algorithm", "modified pose estimation algorithms", "modified adaptive estimation algorithms"
"modified static approximation algorithms" » "modified time approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified passive estimation algorithms\") OR (\"modified static approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified passive estimation algorithms ) OR ( modified static approximation algorithms ))~.
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