@misc{1199491, author = {Gwen E Bennett}, title = {Time & frequency bulletin no. 380:}, year = {1989}, month = {1989-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NIST.IR.89-3910-7}, language = {en}, }