TY  - RPRT
TI  - Covariant method for calculating helicity amplitudes.
AU  - R Vega
AU  - J Wudka
PY  - 1996
DO  - 10.1103/physrevd.53.5286
UR  - https://pubmed.ncbi.nlm.nih.gov/10020525/
ID  - 10020525
ER  -