@article{doi:10.1302/0301-620X.53B4.639,
author = {Somerville, E. W.},
title = {PERTHES' DISEASE OF THE HIP},
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {53-B},
number = {4},
pages = {639-649},
year = {1971},
doi = {10.1302/0301-620X.53B4.639},
url = {https://doi.org/10.1302/0301-620X.53B4.639}
}