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2. Barnes, J. M., and Butler, W. H., Nature, 202, 1061 (1964).
3. Elis, J., and DiPaolo, J. A., Arch. Path., 83, 53 (1967).
4. LeBreton, E., Frayssinet, C., Lafarge, C., and DeRecondo, A. M., Food Cosmet. Toxic., 2, 675 (1964).
5. Butler, W. H., and Wigglesworth, J. S., Brit. J. Exp. Path., 47, 242 (1966).