TY  - RPRT
TI  - Feynman rules for the delta expansion.
AU  - SS Pinsky
AU  - LM Simmons
PY  - 1988
DO  - 10.1103/physrevd.38.2518
UR  - https://pubmed.ncbi.nlm.nih.gov/9959414/
ID  - 9959414
ER  -