References
- ANDERSON, E. S. (1965). Br. med. J. 2, 1289.
- ANDERSON, E. S. and LEWIS, M. J. (1965). Nature, Lond. 206, 579.
- ANDERSON, J. D., GILLESPIE, W. A. and RICHMOND, M. H. (1973). J. med. Microbiol. 6, Pix.
- DATTA, N. (1969). Br. med. J. 2, 407.
- GUINEE, P. A. M., UGUETO, N. and VAN LEEUWEN, N. (1970). Appl. Mictobiol. 20, 531.
- LINTON, K. B., LEE, P. A., RICHMOND, M. H. and GILLESPIE, W. A. (1972). J. Hyg. Camb. 70, 99.
- MANTEN, A., GUINEE, P. A. M., KAMPELMACHER, E. H. and VOOGD, C. E. (1971). Bull. Wld. Hlth. Org. 45, 85.
- MOORHOUSE, E. C. (1969). Br. med. J. 2, 405.
- PORGORZELSKA, A. and WENCIL, Z. (1965). Medycyna Dosiviadeyatna. i. Mikrobiologia. 17, 213.
- SCHON, E., WAGNER, V., MANDLEKOVA, Z., ZIEBLEROVA, Z., WAGNEROVA, M. and DRNKOVA, V. (1971). Cslka Epidem. Microbiol. Immunol. 20, 1.
- SMITH, H. W. (1969). Lancet. i, 1174.
- SMITH, H. W. (1970). Nature, Lond. 228, 1286.
- SMITH, H. W. (1973). Nature, Lond. 243, 237.
- SMITH, H. W. and CRABB, W. E. (1957). Vet. Rec. 69, 24.
- SMITH, H. W. and CRABB, W. E. (1960). J. Path. Bact. 79, 243.
- WELLS, D. M. and JAMES, O. B. (1973). J. Hyg. Camb. 71, 209.
- WIEDEMANN, B., KNOTHE, H. and DOLL, E. (1970). Zentbl. Bakt. I. Orig. 213, 183.