1. Respiratory muscle strength in chronic obstructive pulmonary disease;Rochester, D.F.; Braun, N.M.T.; Arora, N.S.;Am Rev Respir Dis,1979
2. Postural relief of dyspnoea in severe chronic obstructive pulmonary disease;Sharp, J.T.; Druz, W.S.; Moisan, T.; Forster, J.; Machnach, W.;Am Rev Respir Dis,1980
3. Maximal respiratory pressures: normal values and relationship to age and sex;Black, L.F.; Hyatt, R.E.;Am Rev Respir Dis
4. Reference spirometric values using techniques and equipment that meets ATS recommendations;Crapo, R.O.; Morris, A.H.; Gardiner, R.M.;Am Rev Respir Dis,1981
5. Physical signs of diffuse airways obstruction and lung distension;Campbell, E.J.M.;Thorax,1969