@article{PhysRevFocus.17.4, title = {Electron Speedometer}, author = {Krieger, Kim}, journal = {Phys. Rev. Focus}, volume = {17}, issue = {}, pages = {4}, numpages = {1}, year = {2006}, month = {Feb}, doi = {10.1103/PhysRevFocus.17.4}, url = {http://link.aps.org/doi/10.1103/PhysRevFocus.17.4}, publisher = {American Physical Society} }