@article{doi:10.1302/0301-620X.68B4.3733840,
author = {Christensen, F and Soballe, K and Ejsted, R and Luxhoj, T},
title = {The Catterall classification of Perthes' disease: an assessment of reliability},
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {68-B},
number = {4},
pages = {614-615},
year = {1986},
doi = {10.1302/0301-620X.68B4.3733840},
url = {https://doi.org/10.1302/0301-620X.68B4.3733840}
}