@misc{1189316, author = {P D LaFleur}, title = {Reference materials for the determination of trace elements in biological fluids:}, year = {1973}, month = {1973-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NBS.IR.73-406}, language = {en}, }