1. Accuracy and reproducibility of the Assess peak flow meter;van Schayck;Eur Respir J,1990
2. Accuracy and reproducibility of the Assess peak flow meter;Imbruce;Eur Respir J,1991
3. Accuracy and reproducibility of the Assess peak flow meter;Milledge;Eur Respir J,1991
4. Evaluation of the agreement between portable peak flow meters and a calibrated pneumotachometer;Simmons;Respiratory Care,1993
5. The accuracy of portable peak flow meters;Miller;Thorax,1992