TY  - RPRT
TI  - Instability in spondylolisthesis.
AU  - O Friberg
PY  - 1991
DO  - 10.3928/0147-7447-19910401-11
UR  - https://pubmed.ncbi.nlm.nih.gov/2038581/
ID  - 2038581
ER  -