1. heterogeneity both among the new untypable;Anderson, E.S.;J. gen. Microbiol,1953
2. -, and Williams, R. E. 0. (1956). J. clin. Path., 9, 94.
3. Asheshov, E. H., and Rippon, J. E. (1959). J. gen. Microbiol., 20, 634.
4. Blair, J. E., and Williams, R. E. 0. (1961). Bull. Wld Hlth Org., 24, 771.
5. that the new untypable organisms often had several;Bynoe, E.T.;Canad. J,1956