1. Arthuis, M., Lyon, G., and Thieffry, S. (1960). Rev. Neurol., 103, 329.
2. Baker, A. B., and Cornwell, S. (1954). A.M.A. Arch. Neurol. Psychiat.
3. Beswick, T. S. L. (1958). J. Path. Bact., 76, 598.
4. Paper presented at the 7th Symposium of the European Association against Poliomyelitis;Beswick, T.S.L.; Winter, Maureen M.,1961
5. Beswick, T. S. L., and Winter, Maureen M., and Coid, C. R. (1961). J. Hyg. (Lond.), 59, 395. Biological Standards Control Laboratory (1957). Brit. med. J., 2, 124.