@article{doi:10.1302/0301-620X.63B4.7298673,
author = {Kadziolka, R and Asztely, M and Hanai, K and Hansson, T and Nachemson, A},
title = {Ultrasonic measurement of the lumbar spinal canal. The origin and precision of the recorded echoes},
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {63-B},
number = {4},
pages = {504-507},
year = {1981},
doi = {10.1302/0301-620X.63B4.7298673},
url = {https://doi.org/10.1302/0301-620X.63B4.7298673}
}