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3. Congenital skeletal anomalies of the spine: An analysis of the charts and roentgenograms of 264 patients;BLUMEL, J.; EVANS, E.B.; HADNOTT, J.L.; EGGERS, G.W.N.;American Surgeon,1962
4. Studies on the appearance of the centres of ossification of the axial skeleton in the feline foetus. Zentralblatt für Veterinärmedizin C: Anatomia, Histologia;BOYD, J.S.;Embryolia,1976
5. The reaction of intervertebral discs to compression forces;HIRSCH, C.;Journal of Joint and Bone Surgery (America),1955