Perhaps you should try some spelling variations:
"modified multiobjective optimisation algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithm", "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm"
"modified cover estimation algorithms" » "modified cover estimation algorithm", "modified cover optimization algorithms", "modified cover approximation algorithms", "modified cover estimations algorithms", "modified pose estimation algorithms", "modified sphere estimation algorithms"

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