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There's an appendix on the landmark paper by Page & Brin "The Anatomy of a Large-Scale Hypertextual Web Search Engine"[1] which is very much tongue-in-cheek with the direction Google has taken in the following years: one relating to how advertising is bound to create fewer useful search results for its users, in an attempt to not only add more search results for paying ads, but for filtering unwelcome content for the advertisers.
[1]:
https://storage.googleapis.com/pub-tools-public-publication-data/pdf/334.pdf