1. Cotes, J.E. and Gilson, J.C. (1956) Effect of oxygen on exercise ability in chronic respiratory insufficiency. Use of portable apparatus. Lancet, ii, 872–6.
2. Barach, A.L. (1959) Ambulatory oxygen therapy: oxygen inhalation at home and out-of-doors. Dis. Chest, 35, 229–41.
3. Campbell, E.J.M. (1960) A method of controlled oxygen administration which reduces the risk of carbon-dioxide retention. Lancet, ii, 12–14.
4. Kitchin, A.H., Lowther, C.P. and Matthews, M.B. (1961) The effects of exercise and of breathing oxygen-enriched air on the pulmonary circulation in emphysema. Clin. Sci., 21, 93–106.
5. Cotes, J.E., Pisa, Z. and Thomas, A.J. (1963) Effect of breathing oxygen upon cardiac output, heart rate, ventilation, systematic and pulmonary blood pressure in patients with chronic lung disease. Clin. Sci., 25, 305–21.