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27. Instability in lumbar spondylolisthesis: a radiologic study of several concepts. Penning L, Blickman JR. AJR Am J Roentgenol; 1980 Feb; 134(2):293-301. PubMed ID: 6766236 [Abstract] [Full Text] [Related]
35. [Editorial: Significance of functional x-ray examination of the spine in clinical diagnosis]. Hlaca M, Rudez V. Lijec Vjesn; 1973 Jul; 95(7):373-7. PubMed ID: 4742191 [No Abstract] [Full Text] [Related]