@inproceedings{chen_chang_chen_chien_lee_lin_wang, 
  title={Externally Controlled Injection of Electrons by a Laser Pulse in a Laser Wakefield Electron Accelerator}, 
  DOI={10.1109/pac.2005.1591567}, 
  publisher={IEEE}, 
  author={Chen and Chang and Chen and Chien and Lee and Lin and Wang}
  }