1. Braun, H. (1955). Fortschr. Rontgenstr., 83, 844.
2. Quoted by Kessel;Bull, J.,1950
3. well known 'fish vertebra' deformity. In secondary neoplasms there is found irregular;infiltration, Cross; O., G.; Reavis, J.R.; Saunders, W.W.;J. Neurosurg,1949
4. Gough, J., and Wentworth, J. E. (1949). Proc. 9th int. Congr. industr.
5. Med., London, 1948, p. 661.