TY  - RPRT
TI  - Time and frequency users manual 
AU  - Kamas, George
AU  - Kamas, George
AU  - Howe, Sandra L
PY  - 1990
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST SP 559r1
DO  - 10.6028/NIST.SP.559r1
ER  -