==References====External links==*Nobel Prize in Physics 1989*The High-precision Penning Trap Mass Spectrometer SMILETRAP in Stockholm, Sweden*High-precicion mass determination of unstable nuclei with a Penning trap mass spectrometer at ISOLDE/CERN, Switzerland
* Nobel Prize in Physics 1989* The High-precision Penning Trap Mass Spectrometer SMILETRAP in Stockholm, Sweden* High-precicion mass determination of unstable nuclei with a Penning trap mass spectrometer at ISOLDE/CERN, Switzerland