¹ Erdinger, L., Rezvani, P., Hammes, F., & Sonntag, H.-G. (1999). Improving Indoor Air Quality in Hospital Environments and Dental Practices with Modular Stand-Alone Air Cleaning Devices. Research Report of the Institute of Hygiene, University of Heidelberg, Germany, presented at the 8th International Conference on Indoor Air Quality and Climate, Indoor Air '99, Edinburgh, Scotland.
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