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== 역사 ==
[[프리먼 다이슨]]과<ref>{{cite journal |이름=F.|성= Dyson | 저자고리=프리먼 다이슨 |날짜=1949 |title=The ''S'' matrix in quantum electrodynamics |journal=Phys.Physical Rev.Review |volume=75 |page쪽=1736 |doi=10.1103/PhysRev.75.1736|bibcode = 1949PhRv...75.1736D| 언어고리=en }}</ref>과 [[줄리언 슈윙거]]가<ref>{{cite저널 journal인용 |이름=J.|성= Schwinger |저자고리=줄리언 슈윙거 |날짜=1951 |title=On the Green’s functions of quantized fields I |journal=Proceedings of the National Academy of Sciences of the United States of America |volume=37|호=7 |pages=452–459452–455 |bibcode = 1951PNAS...37..452S |doi = 10.1073/pnas.37.7.452 | 언어고리=en }}</ref><ref>{{저널 인용 |이름=J.|성= Schwinger |저자고리=줄리언 슈윙거 |날짜=1951 |title=On the Green’s functions of quantized fields II |journal=Proceedings of the National Academy of Sciences of the United States of America |volume=37 |호=7|pages=455–459 |bibcode = 1951PNAS...37..455S |doi =10.1073/pnas.37.7.455 | 언어고리=en }}</ref>가 도입하였다.
== 참고 문헌 ==
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