TY  - JOUR
AU  - M Bradley
AU  - James Porto
AU  - S Rainville
AU  - J Thompson
AU  - D Pritchard
C2  - Physical Review Letters
DA  - 1999-01-01 00:01:00
LA  - en
M1  - 83
PB  - Physical Review Letters
PY  - 1999
TI  - Penning Trap Measurements of the Masses of <sup>133</sup>Cs, <sup>87,85</sup>Rb, and <sup>23</sup>Na with Uncertainties &lt;0.2 ppb
ER  -