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IEEE / IET Electronic Library
The IEEE Xplore digital library is a powerful resource for discovery and access to scientific and technical content published by the IEEE  and its publishing partners. IEEE Xplore provides Web access to more than 3-million full-text documents from some of the world's most highly cited publications in electrical engineering, computer science and electronics.
IoP Science
IOPscience is an online service for journal content published by Institute of Physics Publishing. IOPscience embraces innovative technologies to make it easier for researchers to access scientific, technical and medical content. 
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