TY  - RPRT
TI  - NIST time and frequency bulletin no. 502 
AU  - Bennett, Gwen E
PY  - 1999
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST IR 5082-09
DO  - 10.6028/NIST.IR.5082-09
ER  -