@article{Cao Long:2006,
  author  = "V. Cao Long and P. Goldstein and S. Vu Ngoc",
  title   = "On existence of solitons for the second harmonic equations of a laser beam",
  journal = "Communications in Physics",
  volume  = "Suppl.",
  pages   = "136--139",
  year    = "2006",
  note    = "Proceedings of 30th National Conference of Teoretical Physics",
}