@article{doi:10.1302/0301-620X.53B1.37,
author = {Catterall, A.},
title = {THE NATURAL HISTORY OF PERTHES' DISEASE},
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {53-B},
number = {1},
pages = {37-53},
year = {1971},
doi = {10.1302/0301-620X.53B1.37},
url = {https://doi.org/10.1302/0301-620X.53B1.37}
}