@misc{indiciaee21cae034576,
  title = {Data evaluation of trace elements determined in Nigerian coal using cluster procedures.},
  author = {I O B Ewa},
  year = {2004},
  doi = {10.1016/j.apradiso.2003.10.002},
  url = {https://pubmed.ncbi.nlm.nih.gov/15082055/},
  note = {Source identifier: 15082055}
}