1. Consider biofiltration for decontaminating gases;Bohn;Chem. Eng. Prog.,1992
2. Health Services Development. Pollution of Operating Departments etc. by Anaesthetic Gases;Department of Health and Social Security,1976
3. Peat as an agent in biological degradation: Peat biofilters;Martin,1991
4. Halothane anaesthetic and the ozone layer;Nørreslet;Lancet,1989
5. Exhaust gas purification;Ottengraf,1986