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2. Perception of asthma;Rubinfeld, A.R.; Pain, M.C.F.;Lancet,1976
3. The perception of breathlessness in asthma;Burdon, J.G.W.; Juniper, E.F.; Killian, K.J.; Hargreave, F.E.; Campbell, E.J.M.;Am Rev Respir Dis,1982
4. Assessing severity of asthma with Wright peak-flow meter;Murray, A.B.; Hardwick, D.F.; Pirie, G.E.; Fraser, B.M.;Lancet,1977
5. Home monitoring of peak expiratory flow rates using Mini-Wright peak flow meter in diagnosis of asthma;Prior, J.G.; Cochrane, G.M.;J R Soc Med,1980