@article{doi:10.1302/0301-620X.54B3.442,
author = {Pennal, George F. and Conn, Garson S. and McDonald, Glen and Dale, Gordon and Garside, Henry},
title = {MOTION STUDIES OF THE LUMBAR SPINE },
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {54-B},
number = {3},
pages = {442-452},
year = {1972},
doi = {10.1302/0301-620X.54B3.442},
url = {https://doi.org/10.1302/0301-620X.54B3.442}
}