1. E. Andersson: inLassen, Management of Life-threatening Poliomyelitis . E. & S. Livingstone, EdinburghandLondon, 1956 , p.740 .
2. XVIII. Causes of Death
3. AN OUTBREAK OF POLIOMYELITIS
4. G. Fanconi: Third International Poliomyelitis Conference . J. P. Lippincott Company, PhiladelphiaandMontreal, pp.108 , 108 , 1955 .
5. M. Gozzano:Ibid, p.124 .