ASEO has negatives. 584-596.  Especially early on, some publishers did not allow Scholar to crawl their journals.  Individuals, logging on through a Google account with a bona fide address usually linked to an academic institution, can now create their own page giving their fields of interest and citations. Link resolvers (for example, SFX, produced by the vendor of MetaLib, Discovery Resolver, Article Linker, and WebBridge) are tools that enable users to navigate direct to the resource. MetaLib for example uses Z39.50, which enables it to bypass the database’s native search interface and use its own search system to retrieve and display results. First, a stable document identifier that uniquely identifies a document.  They concluded that citation counts from Google Scholar should only be used with care especially when used to calculate performance metrics such as the h-index or impact factor. The best research databases for computer science.  In 2011, Google removed Scholar from the toolbars on its search pages, making it both less easily accessible and less discoverable for users not already aware of its existence. The main options are title or full text (see below), whereas the Emerald database can also be searched by keyword or abstract. Whereas many other academic search engines list their sources, Google Scholar does not. A "quick search" where the user can do a single box search or a more advanced one with Boolean operators and the option of searching by title, subject, author, ISBN, ISSN or year. " Google Scholar does not publish a list of journals crawled or publishers included, and the frequency of its updates is uncertain. See the diagram, Figure 3, below which shows the elements of the invisible web. 41 No. 4, pp. The authors conclude: "In comparison with many abstracting and indexing databases, Google Scholar does not offer the transparency and completeness to be expected from a scientific information resource. As the name suggests, Google Scholar is an academic search engine from the house of Google. One of the most up-to-date studies of Google Scholar is that by Péter Jacsó (2008). Robinson, M. and Wusteman, J. Whatever the source, if the search engine is to provide a full picture it must be able to gain access to this content. Such pages include text documents, survey data in relational databases, and dynamic HTML pages. 24 No. Several downstream packages like Harzing's Publish or Perish also use its data. If Google Scholar finds that e.g. , Through its "cited by" feature, Google Scholar provides access to abstracts of articles that have cited the article being viewed.  As a consequence, the first search results are often highly cited articles.  Google Scholar embeds clickable citation links within the case and the How Cited tab allows lawyers to research prior case law and the subsequent citations to the court decision. That's not a bad thing at all and greatly expands the academic universe.  It indexes "full-text journal articles, technical reports, preprints, theses, books, and other documents, including selected Web pages that are deemed to be 'scholarly. A "multisearch" option where the user can select databases according to category. ", Online Information Review, Vol. As such, it may not display exactly as originally intended. 277-289. Oberhelman, D. (2006), "The time machine: federated searching today and tomorrow", Reference Reviews, Vol. 31 No. You can install it from the Chrome Webstore. The whole article is well worth reading for any serious Google Scholar user. 365-375. , Search engine optimization for Google Scholar.  This estimate also determined how many documents were freely available on the web. 5-20. A second key feature of academic databases is that documents that have been indexed once are not removed. Additionally, federated search engines can only search citations, not full-text or abstracts, so that will be the basis of their relevancy ranking. Ford, N. and Mansourian, Y. There was confusion about authentication, the SFX linking symbol, the cross-search (choosing databases) option, and navigation. Google Scholar does not search the entire public web, but limits it's scope to resources from academic publishers, universities, and academic repositories. This option is popular with libraries because of the ability to search multiple databases through one interface; the user can plug in a word or a phrase into a single search box and end up with a number of relevant results in a merged list.  The Google Scholar Legal Content Star Paginator extension inserts Westlaw and LexisNexis style page numbers in line with the text of the case.. There has been much concern in academic library circles that students are infected by this sort of instant information gratification, which has set them against the more structured world of libraries.  As of 2010, Google Scholar was not able to shepardize case law, as Lexis can. How these options work, and how they are described, varies according not only to the system but also its implementation, but here is an example from the Pennsylvania State University’s MetaLib (Figure 7), which offers: Results from the "quick search" option are presented according to database, as shown in Figure 8 below: Exeter University Library uses MetaFind, which it is possible to access from an icon on the library catalogue page: Users can search the library’s electronic databases and other resources via a simple search with options of keyword, title, author, or subject, or they can go to an advanced search option which allows them to search individual databases and use Boolean operators.
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