@article{1958,
  author = {O. Cohen and A. Lytle and Xiaoshi Zhang and Margaret Murnane and Henry Kapteyn},
  title = {Optimizing quasi-phase matching of high harmonic generation using counterpropagating pulse trains},
  year = {2007},
  journal = {Optics Letters},
  volume = {32},
  pages = {2975},
  month = {2007-10},
  issn = {0146-9592},
  doi = {10.1364/OL.32.002975},
}