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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Birkhoff G. D. Matter, Electricity and Gravitation in Flat Space-Time. Proc Natl Acad Sci U S A. 1943 Aug;29(8):231–239. doi: 10.1073/pnas.29.8.231. [DOI] [PMC free article] [PubMed] [Google Scholar]
