TY  - RPRT
TI  - Changes in sample collection and analytical techniques and effects on retrospective comparability of low-level concentrations of trace elements in ground water.
AU  - T Ivahnenko
AU  - Z Szabo
AU  - J Gibs
PY  - 2001
DO  - 10.1016/s0043-1354(01)00094-x
UR  - https://pubmed.ncbi.nlm.nih.gov/11561622/
ID  - 11561622
ER  -