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However, these \u2018date stamps\u2019 are not determined by the first occurrence of the pages in the web, but by the last date at which a page was updated or a new page was added and the search engine\u2019s crawler updated this change in the database. This has major implications for the use of search engines in scholarly research as well as theoretical implications for the conceptions of time and temporality. This article examines the interplay between the different updating frequencies by using AltaVista and Google for searches at different moments of time. Both the retrieval of results and the structure of retrieved information erodes over time.<\/jats:p>","DOI":"10.1177\/1461444806069648","type":"journal-article","created":{"date-parts":[[2006,11,13]],"date-time":"2006-11-13T14:06:49Z","timestamp":1163426809000},"page":"901-924","source":"Crossref","is-referenced-by-count":28,"title":["Multiple presents: how search engines rewrite the past"],"prefix":"10.1177","volume":"8","author":[{"given":"Iina","family":"Hellsten","sequence":"first","affiliation":[{"name":"Royal Netherlands Academy of Arts and Sciences, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Loet","family":"Leydesdorff","sequence":"additional","affiliation":[{"name":"University of Amsterdam, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul","family":"Wouters","sequence":"additional","affiliation":[{"name":"Royal Netherlands Academy of Arts and Sciences, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2006,12,1]]},"reference":[{"key":"atypb1","volume-title":"Time","author":"Adam, B.","year":"2004"},{"issue":"3","key":"atypb2","volume":"2","author":"Bar-Ilan, J.","year":"1999","journal-title":"Cybermetrics"},{"key":"atypb3","doi-asserted-by":"publisher","DOI":"10.1023\/A:1005682102768"},{"issue":"3","key":"atypb4","first-page":"371","volume":"50","author":"Bar-Ilan, J.","year":"2002","journal-title":"Library Trends"},{"key":"atypb5","volume-title":"The Media-lab. 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