@article{22571,
  author = {Nasim A Mullen and Seema Bhangar and Susanne V Hering and Nathan M Kreisberg and William W Nazaroff},
  title = {Ultrafine particle concentrations and exposure in six school classrooms in northern California},
  year = {2011},
  journal = {Indoor Air},
  volume = {21},
  pages = {77-87},
  language = {eng},
}