@article{doi:10.1302/0301-620X.64B3.7096393,
author = {Purry, NA},
title = {The incidence of Perthes' disease in three population groups in the Eastern Cape region of South Africa},
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {64-B},
number = {3},
pages = {286-288},
year = {1982},
doi = {10.1302/0301-620X.64B3.7096393},
url = {https://doi.org/10.1302/0301-620X.64B3.7096393}
}