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

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