@article{doi:10.1302/0301-620X.60B4.711793,
author = {Porter, RW and Wicks, M and Ottewell, D},
title = {Measurement of the spinal canal by diagnostic ultrasound},
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {60-B},
number = {4},
pages = {481-484},
year = {1978},
doi = {10.1302/0301-620X.60B4.711793},
url = {https://doi.org/10.1302/0301-620X.60B4.711793}
}