@article{19282,
  author = {Ivers R. and Hung D. and Stevenson Mark},
  title = {Motorcycle helmets in Vietnam: ownership, quality, purchase price and affordability},
  year = {2008},
  journal = {Traffic Injury Prevention},
  volume = {9},
  number = {2},
  pages = {135-43. },
  language = {eng},
}