[1]
M. C. Forster, S. Kumar, R. A. Rajan, W. Guy Atherton, R. Asirvatham, and V. R. Thava, “Head-at-risk signs in Legg-Calvé-Perthes disease: Poor inter- and intra-observer reliability”, ActaO, vol. 77, no. 3, pp. 413–417, Jan. 2006.