TY  - RPRT
TI  - NIST time and frequency bulletin: December 2019
AU  - Rodriguez, Kelsey
PY  - 2019
PB  - National Institute of Standards and Technology
CY  - Boulder, CO
SN  - NIST IR 8261-12
DO  - 10.6028/NIST.IR.8261-12
ER  -