TY  - RPRT
TI  - Theorem for functional derivatives in density-functional theory.
AU  - H Ou-Yang
AU  - M Levy
PY  - 1991
DO  - 10.1103/physreva.44.54
UR  - https://pubmed.ncbi.nlm.nih.gov/9905653/
ID  - 9905653
ER  -