1. Corticosteroid infiltration of the extradural space;BARRY, P.J.C.; KENDALL, P.H.;Annals of Physical Medicine,1962
2. A comparison between epidural anaesthesia and bed rest in sciatica;COOMES, E.N.;British Medical Journal,1961
3. Textbook of Orthcpaedic Medicine, Third Edn;CYRIAX, J.,1957
4. Extradural corticosteroid injection in management of lumbar nerve root compression;DILKE, T.F.W.; BURRY, H.C.; GRAHAME, R.;British Medical Journal,1973
5. Intrasacral epidural injection in the treatment of sciatica;EVANS, W.;Lancet,1930