1. Indoor air pollution in Rotterdam homes;Biersteker;Air Wat. Pollut. Int. J.,1965
2. Absorption of atmospheric sulphur dioxide by clay brick and other building materials;Gilardi;Rutgers University, Ph.D. Thesis,1965
3. The permanence of paper: The use of radioactive sulphur to study the pick-up of sulphur dioxide by paper;Hudson;Paper Technol.,1961