TY  - JOUR
AU  - Donald Sullivan
C2  - Scientific American
DA  - 2002-01-01
LA  - en
PB  - Scientific American
PY  - 2002
TI  - What is the Basis for the Definition of the Second?
UR  - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=105572
ER  -