TY  - RPRT
TI  - QCD sum rules and neutron-proton mass difference.
AU  - KC Yang
AU  - WY Hwang
AU  - EM Henley
AU  - LS Kisslinger
PY  - 1993
DO  - 10.1103/physrevd.47.3001
UR  - https://pubmed.ncbi.nlm.nih.gov/10015904/
ID  - 10015904
ER  -