@article{5679,
  author = {D. A. Jaroszynski and R. Prazeres and F. Glotin and J. M. Ortega and D. Oepts and A. F. G. van der Meer and G.M.H. Knippels and P. W. van Amersfoort},
  title = {Free-Electron Laser Efficiency Enhancement, Gain Enhancement, and Spectral Control Using a Step-Tapered Undulator},
  year = {1995},
  journal = {Physical Review Letters},
  volume = {74},
  number = {12},
  pages = {2224-2227},
  month = {Mar 20},
  isbn = {0031-9007},
  doi = {10.1103/PhysRevLett.74.2224},
  language = {eng},
}