Pollard, T. C., Villar, R. N., Norton, M. R., Fern, E. D., Williams, M. R., Simpson, D. J., . . . Carr, A. J. (2010). Femoroacetabular impingement and classification of the cam deformity: The reference interval in normal hips. Informa Healthcare.

Pollard, Thomas CB, Richard N. Villar, Mark R. Norton, E Darren Fern, Mark R. Williams, David J. Simpson, David W. Murray, i Andrew J. Carr. Femoroacetabular Impingement and Classification of the Cam Deformity: The Reference Interval in Normal Hips. Informa Healthcare, 2010.

Pollard, Thomas CB, et al. Femoroacetabular Impingement and Classification of the Cam Deformity: The Reference Interval in Normal Hips. Informa Healthcare, 2010.