TY  - RPRT
TI  - Linear-response theory revisited.
AU  - DM Bylander
AU  - YM Gu
AU  - L Kleinman
PY  - 1995
DO  - 10.1103/physrevb.51.2566
UR  - https://pubmed.ncbi.nlm.nih.gov/9979013/
ID  - 9979013
ER  -