@article{Nguyen Van:2006,
  author  = "P. Nguyen Van and H. Dinh Van and V. Cao Long",
  title   = "Optical bistability effect in DFB laser with two sections",
  journal = "VNU. Journal of Science : Mathematics - Physics",
  volume  = "T. 22",
  number  = "no 2",
  pages   = "47--54",
  year    = "2006",
}