Perhaps you should try some spelling variations:
"modified adaptive quantization algorithms" » "modified adaptive estimation algorithms", "modified adaptive optimization algorithms", "modified adaptive ventilation algorithms", "modified passive quantization algorithms"
"modified changing approximation algorithms" » "modified diophantine approximation algorithms", "modified caging approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified changing approximation algorithms\") OR (\"modified adaptive quantization algorithms\"))~".
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