@article{1056,
  author = {A. Paul and R. Bartels and R. Tobey and H. Green and S. Weiman and Ivan Christov and Margaret Murnane and Henry Kapteyn and Sterling Backus},
  title = {Quasi-phase-matched generation of coherent extreme-ultraviolet light},
  year = {2003},
  journal = {Nature},
  volume = {421},
  pages = {51-54},
  month = {2003-01},
  issn = {0028-0836},
  doi = {10.1038/nature01222},
}