1. Fuisz, A., Goodman, D., Kamm, D. E., Cahill, G. F., and Marble, A., J. Clin. Invest., 44, 1049 (1965).
2. Wolf, A. V., Amer. J. Physiol., 133, 496 (1941).
3. Aber, G. M., and Bishop, J. M., Clin. Sci., 28, 511 (1965).
4. Fenton, J. C. B., Clin. Chim. Acta, 7, 163 (1962).
5. Middleton, J. E., and Griffiths, W. J., Brit. Med. J., ii, 1525 (1957).