Full text
PDF









Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Schwinger J. On the Green's Functions of Quantized Fields: I. Proc Natl Acad Sci U S A. 1951 Jul;37(7):452–455. doi: 10.1073/pnas.37.7.452. [DOI] [PMC free article] [PubMed] [Google Scholar]
