At the beginning of 2020, PubMed has over 30 million citations and abstracts. Since 1997, it was made available to online public use. Starting from 1971, its online access was restricted to the use of academic institutions as University libraries. PubMed is a free search engine for references and abstracts on medical, life sciences, and biomedical topics. Bibliometricians suggest Microsoft Academic as a strong competitor to Google Scholar.
It covers over 220 million publications including about 88 million journal articles. It provides the researcher with the opportunity to search academic publications, literature and to perform citation analysis. It was firstly named Microsoft Academic Search and ended in 2012, then re-launched in 2016 as Microsoft Academic. Microsoft Academic is a free tool developed by Microsoft. By the end of 2019, the number of scanned books reached over 40 million titles. It was firstly developed under the name Google Print in 2004.
#Top specialized search engines full
Google Books is a free tool that enables the researcher to search for full texts inside the books and magazines scanned in Google database. Many researchers find Google scholar as powerful as many subscription-based search engines when looking for citation of articles.
It is a free tool, and is considered the world's largest academic search engine in January 2018.
Google Scholar is a search engine that allows the researcher to find out articles, technical reports, theses, citations, books and other documents including selected Web pages. There are many search engines that can shorten the time required for data collection and we are taking a look at the best free search engines you can get benefit from in the following list: 1- Google Scholar It enables anyone searching for scientific information to precisely find and pick up the information they need including peer-reviewed articles, genuine information, author home pages, and university web sites. Search engines are vital tools that ease the process of research for scientific and research professors, lecturers and students.