1. Cospar Technical Bulletin (in the press);Alder, V.G.;J. clin. Path,1968
2. Blohm, S. G. (1959). Acta derm.-venereol. (Stockh.), 39, 450.
3. Critchfield, E. E., and Johnson, J. B. (1957). Anal. Chem., 29, 797.
4. Dickinson, J. C., and Wagg, R. E. (1967). J. Appl. Bact., 30, 340.
5. Gibson, G. L., Johnston, H. P. (1967). Brit. IHosp. J. and Soc. Sci. Rev., 77, 1208.