@misc{indiciae8c96497cb4d8,
  title = {Generalized gradient approximation for the relativistic exchange-only energy functional.},
  author = {E Engel and S Keller and RM Dreizler},
  year = {1996},
  doi = {10.1103/physreva.53.1367},
  url = {https://pubmed.ncbi.nlm.nih.gov/9913025/},
  note = {Source identifier: 9913025}
}