Vertipedia offers a fast, efficient means of finding information. Search by keywords or phrases across a range of resources including documents provided by the Vertical Flight Society as well as public sources across the internet.
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Google Scholar provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: articles, theses, books, abstracts and court opinions, from academic publishers, professional societies, online repositories, universities and other web sites.
ScienceResearch.com is a free, publicly available deep web search engine that uses advanced "federated search technology" to return high quality results by submitting your search query - in real-time - to other well respected search engines then collating, ranking and dropping duplicates of the results.
Semantic Scholar is designed to be a "smart" search service for journal articles. It uses a combination of machine learning and natural language processing to add a layer of semantic analysis to the traditional methods of citation analysis. It is designed to quickly highlight the most important papers and identify the connections between them.