TY  - RPRT
TI  - Time & frequency bulletin no. 381 
AU  - Bennett, Gwen E
PY  - 1989
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST IR 89-3910-8
DO  - 10.6028/NIST.IR.89-3910-8
ER  -