TY  - RPRT
TI  - Data evaluation of trace elements determined in Nigerian coal using cluster procedures.
AU  - I O B Ewa
PY  - 2004
DO  - 10.1016/j.apradiso.2003.10.002
UR  - https://pubmed.ncbi.nlm.nih.gov/15082055/
ID  - 15082055
ER  -