1. Ammerman, B J & Smith, D R (1975). Papilledema and spinal cord tumors. Surg. Neurol. 3, 55.
2. Anderson, F & Carson, M (1953). Spinal cord tumors in children. J. Pediat. 43, 190.
3. Armitage, P (1971). Statistical Methods in Medical Research. Blackwell, London.
4. Arseni, C, Horvath, L & Iliesgu, D (1967). Intraspinal tumors in children. Psychiat. Neurol. Neurochir. 70, 123.
5. Austin, G M (1960). The significance and nature of pain in tumors of the spinal cord. Surg. Forum, 10, 782.