@article{doi:10.1302/0301-620X.49B3.520,
author = {Lettin, A. W. F.},
title = {DIAGNOSIS AND TREATMENT OF LUMBAR INSTABILITY},
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {49-B},
number = {3},
pages = {520-529},
year = {1967},
doi = {10.1302/0301-620X.49B3.520},
url = {https://doi.org/10.1302/0301-620X.49B3.520}
}