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Affiliation
- Massachusetts Institute of Technology149
- Delft University of Technology109
- University of California, Irvine72
- National Academies Press (NAP)18
- University of Michigan14
- University of Hong Kong13
- TED-Ed9
- University of Oxford9
- DOAB (Directory of Open Access Books)8
- Hong Kong Polytechnic University8
- Open Textbook Library8
- Chalmers University of Technology7
- OAPEN (Open Access Publishing in European Networks) Foundation7
- Rice University6
- Rochester Institute of Technology6
- InTechOpen5
- City University of Hong Kong4
- ETH Zurich4
- Engineer4Free4
- Harvard University4