TY  - RPRT
TI  - Spectral lines as frequency standards.
AU  - H LYONS
PY  - 1952
DO  - 10.1111/j.1749-6632.1952.tb26600.x
UR  - https://pubmed.ncbi.nlm.nih.gov/13139168/
ID  - 13139168
ER  -