TY - JOUR AU - Levine, Judah C2 - Review of Scientific Instruments DA - 1999-01-01 LA - en M1 - 70 PB - Review of Scientific Instruments PY - 1999 TI - Introduction to Time and Frequency Metrology UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=105391 ER -