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

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