1. Does treatment for severe emphysema and chronic bronchitis really help? (A response);Petty;Chest,1974
2. Ventilation and arterial blood gas changes induced by pursed lips breathing;Mueller;J Appl Physiol,1970
3. The efficacy of pursed-lips breathing in patients with chronic obstructive pulmonary disease;Thoman;Am Rev Respir Dis,1966
4. The effects of augmented breathing maneuvers on ventilation in severe chronic airway obstruction;Petty;Respir Care,1971
5. Physiologic advantages of grunting, groaning and pursed-lip breathing: adaptative symptoms related to the development of continuous positive pressure breathing;Barach;Bull NY Acad Med,1973