TY  - RPRT
TI  - delta expansion applied to quantum electrodynamics.
AU  - CM Bender
AU  - S Boettcher
AU  - KA Milton
PY  - 1992
DO  - 10.1103/physrevd.45.639
UR  - https://pubmed.ncbi.nlm.nih.gov/10014417/
ID  - 10014417
ER  -