TY  - RPRT
TI  - Effective summation over intermediate states in double-beta decay.
AU  - J Engel
AU  - WC Haxton
AU  - P Vogel
PY  - 1992
DO  - 10.1103/physrevc.46.r2153
UR  - https://pubmed.ncbi.nlm.nih.gov/9968406/
ID  - 9968406
ER  -