Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
stochastic estimation » stochastic optimization
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
one approximation » time approximation, _ approximation, rough approximations
modified one » modified male, modified near, modified orca

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( modified stochastic estimation algorithms ) OR ( modified one approximation algorithm ))~".
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