@misc{1163036, author = {K F J Heinrich and R B Marinenko}, title = {Standard Reference Materials ::Micro-homogeneity studies of NBS standard reference materials, NBS research materials, and other related samples/}, year = {1979}, month = {1979-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NBS.SP.260-65}, language = {en}, }