TY  - RPRT
TI  - Generalized gradient approximation for the relativistic exchange-only energy functional.
AU  - E Engel
AU  - S Keller
AU  - RM Dreizler
PY  - 1996
DO  - 10.1103/physreva.53.1367
UR  - https://pubmed.ncbi.nlm.nih.gov/9913025/
ID  - 9913025
ER  -