%0 Journal Article
%A ED Simmons
%A HK Graham
%A JP Szalai
%T Interobserver variability in grading Perthes' disease
%D 1990
%J The Journal of Bone & Joint Surgery British Volume
%P 202-204
%V 72-B
%N 2
%R 10.1302/0301-620X.72B2.2312555
%U https://doi.org/10.1302/0301-620X.72B2.2312555
%K