@article{doi:10.1302/0301-620X.71B2.2925740,
author = {Hall, AJ and Barker, DJ},
title = {Perthes' disease in yorkshire},
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {71-B},
number = {2},
pages = {229-233},
year = {1989},
doi = {10.1302/0301-620X.71B2.2925740},
url = {https://doi.org/10.1302/0301-620X.71B2.2925740}
}