TY  - RPRT
TI  - Equivalent Hamiltonians with additional discrete states.
AU  - CR Chinn
AU  - RM Thaler
PY  - 1991
DO  - 10.1103/physrevc.43.254
UR  - https://pubmed.ncbi.nlm.nih.gov/9967066/
ID  - 9967066
ER  -