TY  - RPRT
TI  - Interrelation between variational principles for scattering amplitudes and generalized R-matrix theory.
AU  - CW McCurdy
AU  - TN Rescigno
AU  - BI Schneider
PY  - 1987
DO  - 10.1103/physreva.36.2061
UR  - https://pubmed.ncbi.nlm.nih.gov/9899096/
ID  - 9899096
ER  -