1. Finger clubbing: a quantitative survey by analysis of the shadowgraph;Bentley, D.; Moore, A.; Shwachman, H.;Lancet,1976
2. Curvature of the nails, clubbing of the fingers, and hypertrophic pulmonary osteoarthropathy;Carroll, Jr, D.G.;Transactions of the American Clinical and Climatological Association,1972
3. Editorial: Finger clubbing;Lancet;Lancet,1975
4. Finger clubbing. Validity as a physical sign;Pyke, D.A.;Lancet,1954
5. Regan, G. M., Tagg, B., and Thomson, M. L. (1967).