TY  - RPRT
TI  - NIST time and frequency bulletin: December
AU  - Stephenson, Kathryn
PY  - 2019
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST IR 8205-12
DO  - 10.6028/NIST.IR.8205-12
ER  -