Perhaps you should try some spelling variations:
"modified df simulation algorithms" » "modified df estimation algorithms", "modified df optimization algorithms", "modified df solution algorithm", "modified _ simulation algorithms", "modified a simulation algorithms", "modified 3d simulation algorithms", "modified adam simulation algorithms", "modified bi1 simulation algorithms"
"modified adaptive estimation algorithm" » "modified adaptive ventilation algorithm", "modified quantile estimation algorithm", "modified adaptive quantization algorithm", "modified passive estimation algorithm"

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