1. Bird Corporation, Medical and Industrial Equipment Co. Ltd., Falcoln Road, Sowten Industrial Estate, Exeter, UK. Promotional material.
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3. High frequency jet ventilation;Carlon;Chest,1983
4. Resistance to two-phase gas-liquid flow in the airways;Clarke;J. Appl. Physiol.,1970
5. Viscoelasticity of mucus, its role in ciliary transport of pulmonary secretions;Denton;Am. Rev. Respir. Dis.,1968