@article{doi:10.1302/0301-620X.80B4.0800662,
author = {Shipley, J. A. and Beukes, C. A.},
title = {The nature of the spondylolytic defect},
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {80-B},
number = {4},
pages = {662-664},
year = {1998},
doi = {10.1302/0301-620X.80B4.0800662},
url = {https://doi.org/10.1302/0301-620X.80B4.0800662}
}