@article{2731,
  author = {F. He and Camilo Ruiz and Andreas Becker and U. Thumm},
  title = {Attosecond probing of instantaneous ac Stark shifts in helium atoms},
  year = {2011},
  journal = {Journal of Physics B: Atomic, Molecular and Optical Physics},
  volume = {44},
  pages = {211001},
  month = {2011-11},
  doi = {10.1088/0953-4075/44/21/211001},
}