NDLDT<\/a>\u00a0<\/strong>(Networked Digital Library of Theses and Dissertations) website has links to various digital archives around the world and e-dissertation search engines,\u00a0 including<\/p>\n Research data in open archives<\/strong><\/p>\n re3data.org\u00a0<\/a><\/strong>\u2013 search tool for research data.\u00a0\u00a0For more details, see the registers of repositories<\/a>.<\/p>\n The global association of digital archives OAIster makes archival materials accessible through the worldwide union library catalogue WorldCat. A separate search form has been developed for searching among materials in digital archives that allows searching exclusively among the OAIster materials.<\/p>\n Advanced Search is best suited for this purpose If you do not limit your search from the very beginning, the database offers many options for narrowing your search results.<\/p>\n The number of results is in the brackets after each limiting field. Results can be refined by the format, language, publication year, author, content (fiction\/non-fiction\/biography)\u00a0and topic. Choosing the Open Access limiter at the beginning of the search or while refining the results will show you content from only known open access subdatabases, but for many of the results you get without this filter, links leading to full texts can be found when opening the record.<\/p>\n BASE<\/a> is a multi-disciplinary search engine for scholarly internet resources. It provides more than 150 million documents from more than 7000 sources. Full texts of about 60% of the indexed documents are accessible for free (Open Access). BASE also discloses web resources of the \u201cDeep Web\u201d, which are ignored by commercial search engines or get lost in the vast quantity of hits.<\/p>\n BASE search has lots of options for limiting or expanding the search. You can also use different languages for searching.<\/p>\n The search results are displayed in a list sorted by relevance. You can also order them alphabetically (either by author or title) or by publication date. It is possible to refine the search results by author, subject, DDC, year of publication, content provider, language, document type, access and re-use terms. If you filter by language, keep in mind that \u201cunknown\u201d language means that the language is just not specified \u2013 you can also find English language documents from there. In the list, you will see a quick view of the record; for more information, click on Detail View. If you can not find a link to the full text from the BASE record, you can try checking in Google Scholar.<\/p>\n Please use BASE help page<\/a> for more detailed information.<\/p>\n\n
OAISTER<\/strong><\/h3>\n
\nhttp:\/\/oaister.worldcat.org\/advancedsearch<\/a>.<\/p>\n![\"OAIster](\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/94\/oaister.png\" "\\"oaister.png\\"")
\nFig. 1. OAIster search form.<\/em><\/p>\n![\"OAISter](\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/94\/oaister_results.png\" "\\"oaister_results.png\\"")
\nFig. 2. OAIster search results.<\/em><\/p>\nBASE<\/strong><\/h3>\n
![\"Base](\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/94\/base_search.png\" "\\"base_search.png\\"")
\u00a0Fig. 3. \u00a0BASE advanced search\u00a0<\/em><\/p>\n![\"BASE](\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/94\/base_result.png\" "\\"base_result.png\\"")
\nFig. 4. BASE results view.<\/em><\/p>\nCORE<\/strong><\/h3>\n
![\"CORE](\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/94\/core_advanced_search.png\" "\\"core_advanced_search.png\\"")
![\"CORE](\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/94\/core_results.png\" "\\"core_results.png\\"")
<\/p>\n