1. Barber, M., and Kuper, S. W. A. (1951). J. Path. Bact., 63, 65.
2. Clayton, Y. M., and Noble, W. C. (1963). Trans. St. John's Hosp.
3. Lancet, 2, 1295. -, -;Davies, R.R.; Noble, W.C.;Ibid,1962
4. Duguid, J. P., and Wallace, A. T. (1948). Ibid., 2, 845.
5. Gregory, P. H. (1954). Trans. Brit. mycol. Soc., 37, 390.