1. Williams, V. N., Nature, 198, 203 (1963).
2. Wood, I. B., Pankavich, J. A., Wallace, W. S., Thorson, R. E., Burkhart, R. L., and Waletzky, E., J. Amer. Vet. Med. Assoc., 139, 1101 (1961). Testing of this compound against F. hepatica was first suggested by S. S. Berg of these laboratories.
3. Collins, R. F., Lucas, J. M. S., and Rosenbaum, J., British Patent Application No. 51644/64.