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Barroso, L.A.; Dean, J.; Holzle, U. «Web search for a planet: the google cluster architecture». IEEE Micro, 23, 2, 29-04-2003, pàg. 22–28. DOI: 10.1109/mm.2003.1196112. «We believe that the best price/performance tradeoff for our applications comes from fashioning a reliable computing infrastructure from clusters of unreliable commodity PCs.»