@misc{1187081, author = {Peter L M Heydemann}, title = {The National Measurement System for pressure:}, year = {1976}, month = {1976-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NBS.IR.75-931}, language = {en}, }