1[2]Strebel PM, Sutter RW, Coehi SL, et al. Epidemiology of poliomyelitis in the United States one decade after the last reported case of ingigenous wild virusassociated disease. Clin Infter Dis, 1992,14: 568 - 579.
2[3]Nkowane BM, Wassilak SG, Orenstein WA, et al. TI-Vaccine-associated paralytic poliomyelitis. United States: 1973 through. JAMA, 1984,257:1335 -1340.
