Perhaps you should try some spelling variations:
"modified quantile estimation algorithmss" » "modified quantile estimation algorithm", "modified quantile optimization algorithms", "modified quantile estimation algorithms", "modified quantile optimization algorithmss", "modified quantile optimisation algorithms", "modified adaptive estimation algorithmss"
"modified parameter estimation algorithms" » "modified parameter estimation algorithm", "modified parameter optimization algorithms", "modified parameter optimisation algorithm", "modified parameter estimates algorithms"

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