TY  - JOUR
AU  - Kadziolka, R
AU  - Asztely, M
AU  - Hanai, K
AU  - Hansson, T
AU  - Nachemson, A
DO  - doi:10.1302/0301-620X.63B4.7298673
UR  - https://doi.org/10.1302/0301-620X.63B4.7298673
TI  - Ultrasonic measurement of the lumbar spinal canal. The origin and precision of the recorded echoes
T2  - The Journal of Bone & Joint Surgery British Volume
VL  - 63-B
IS  - 4
PY  - 1981
SP  - 504
EP  - 507
ER  -