Perhaps you should try some spelling variations:
"modified quantile optimization algorithms" » "modified quantile optimisation algorithm", "modified quantile estimation algorithm", "modified quantile optimized algorithms", "modified quantile estimation algorithms", "modified quadratic optimization algorithms", "modified static optimization algorithms", "modified adaptive optimization algorithms"
"modified caging estimation algorithms" » "modified caging estimation algorithm", "modified caging optimisation algorithm", "modified caging approximation algorithms", "modified lighting estimation algorithms"

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