%0 Journal Article %T Tests of CPT and Lorentz Symmetry in Penning-Trap Experiments %A Robert Bluhm %A Alan Kostelecky %A Neil Russell %J Physics %D 1998 %I arXiv %X This talk discusses the sensitivity of electron-positron and proton-antiproton Penning-trap experiments to CPT- and Lorentz-violating effects in the context of an extension of the minimal standard model and quantum electrodynamics. %U http://arxiv.org/abs/hep-ph/9809597v1