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.
Microsoft Academic (MA) goes beyond simple keyword search. It provides recommendations and related results to help you discover more scholarship of interest. MA is not limited to just searching for papers. It provides related information about the most relevant authors, institutions, publication outlets, and research areas. MA's semantic search capabilities ensure the related information is highly relevant to the initial search.