@article{doi:10.1302/1358-992X.95BSUPP_14.SAOA2012-047,
author = {Blake, C and Van Der Merwe, J and Human, B},
title = {Ball bearings, a practical way to calibrate digital x rays in arthroplasty},
journal = {Orthopaedic Proceedings},
volume = {95-B},
number = {SUPP_14},
pages = {47-47},
year = {2013},
doi = {10.1302/1358-992X.95BSUPP_14.SAOA2012-047},
url = {https://doi.org/10.1302/1358-992X.95BSUPP_14.SAOA2012-047}
}