Perhaps you should try some spelling variations:
"modified based continuation algorithms" » "modified based convolution algorithms", "modified based estimation algorithms", "modified based optimization algorithms", "modified male continuation algorithms"
"modified coverage approximation algorithms" » "modified average approximation algorithms"

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