@article{641,
  author = {Y. An and Steven Cundiff},
  title = {Bulk and surface contributions to resonant second-harmonic generation from Si(001) surfaces},
  year = {2002},
  journal = {Applied Physics Letters},
  volume = {81},
  pages = {5174},
  month = {2002},
  issn = {00036951},
  doi = {10.1063/1.1533122},
}