1. Workshop on screening programs for early diagnosis of airway obstruction;Macklem;Am Rev Respir Dis,1974
2. Office spirometry in clinical practice;Permutt;Chest,1978
3. Snowbird workshop on standardization of spirometry: ATS statement;Gardner;Am Rev Respir Dis,1979
4. Reference spirometric values using techniques and equipment that meet ATS recommendations;Crapo;Am Rev Respir Dis,1981