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3. Athey S.;Mobius M. M.andPál J. 2017 ‘The Impact of Aggregators on Internet News Consumption ’ Stanford University Graduate School of Business Research Paper No. 17‐8. seehttps://ssrn.com/abstract=2897960
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5. Correia S. 2016 ‘Linear Models with High‐Dimensional Fixed Effects: An Efficient and Feasible Estimator ’ seehttp://scorreia.com/research/hdfe.pdf