@article{19281,
  author = {Ivers R. and Hung D. and Stevenson Mark},
  title = {Barriers to, and factors associated, with observed motorcycle helmet use in Vietnam},
  year = {2008},
  journal = {Accident Analysis and Prevention},
  volume = {40},
  number = {4},
  pages = {1627-33.},
  language = {eng},
}