@techreport{1502,
  author = {Craig P Wray and G.K Yuill and Associates Ltd},
  title = {Building Materials as a Source of Radon: Computer Simulation of Indoor Radon Concentrations},
  year = {1991},
  month = {01/1991},
  institution = {Ecole Polytechnique},
  publisher = {Ecole Polytechnique},
  language = {eng},
}