Perhaps you should try some spelling variations:
"modified via optimization algorithms" » "modified via optimisation algorithm", "modified via estimation algorithms", "modified via estimation algorithm", "modified _ optimization algorithms", "modified qoe optimization algorithms", "modified stage optimization algorithms", "modified bi1 optimization algorithms", "modified adam optimization algorithms", "modified near optimization algorithms"
"modified dfdaptive quantization algorithm" » "modified adaptive quantization algorithm", "modified dfdaptive estimation algorithm"

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