Perhaps you should try some spelling variations:
"modified passive quantization algorithm" » "modified passive estimation algorithm", "modified adaptive quantization algorithm"
"modified parameter optimisation algorithm" » "modified parameter optimization algorithm", "modified parameter estimation algorithm", "modified parameter optimization algorithms", "modified parameter estimation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified passive quantization algorithm\") OR (\"modified parameter optimisation algorithm\"))~".
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