Resources to search

Academia - Free and open repository of academic journal articles
AES - Audio Engineering Society
ANSI - American National Standards Institute
arXiv
BookBoon
British Library EThOS - E-Theses Online Service
CERN - European Organization for Nuclear Research
CNR - Consiglio Nazionale delle Ricerche
CNRS - Centre national de la recherche scientifique
CiteULike
CNKI - China National Knowledge Infrastructure, 中国知网
Cornell University
DiVA Portal
elib Publications of the DLR
Elsevier
ERIC - Institute of Education Science
EURASIP - European Association for Signal Processing
European Patent Office
FAA - Federal Aviation Administration
Get the Research - Find and understand peer-reviewed research papers
GOOGLE Scholar
The open archive HAL
HP archive
IEEE - Institute of Electrical and Electronics Engineers
IET Digital Library
INFN - Istituto nazionale di fisica nucleare
Infopatia
Introni
ISO - International Organization for Standardization
JDEC - Global Standards for the Microelectronics Industry
JSTOR - Journal Storage
Your Machine Learning and Data Science Community
KEYSIGHT
Lincoln Laboratory Publications Archives
LSE Theses Online
Mendeley
Microsoft Academic
MIT - Massachusetts Institute of Technology
NASA - National Aeronautics and Space Administration
US National Library of Medicine - National Institutes of Health
NDLTD - Global ETD Search
NATO - North Atlantic Treaty Organization
NIST - National Institute of Standards and Technology
OCLC - Online Computer Library Center /A>
Open Access Theses and Dissertations
Open Hardware
Open Library
OpenCore
OsmoCom
OSTI - U.S. Department of Energy Office of Scientific and Technical InformationORA - Oxford University Research Archive
Patents
PIER Progress In Electromagnetics Research
PhothosWare
PLOS - Public Library of Science
PNAS - Proceedings of the National Academy of Sciences
Project Gutenberg
ResearchGate
Rohde & Schwarz
Sandia National Laboratories
Science.gov is a gateway to U.S. government science information.
SDR
Semantic Scholar
Specifications, Standards, Handbooks and Mil-Spec documents
SPIE - International Society for Optics
SPIE - International Society for Optics - Library
SpringerOpen
Stanford Library
TEK, Tektronix
Wikipedia
WHOAS -Woods Hole Scientific Community
Wolfram Alpha
worldwidescience.org