@misc{1253551, author = {T Arnold and J Marshall}, title = {NIST Calibration Services Users Guide: Time and Frequency Measurements (NIST SP 250 2002 ED)}, year = {2002}, month = {2002-11-09 05:11:00}, publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD}, url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=200198}, language = {en}, }