REFERENCES
- Bradley, J. V. Distribution-Free Statistical Tests, Printance - Hall, London, 1968
- Callender, S. T. & Denborough, M. A. Brit. J. Haemat. 1957, 3, 88–106
- Callnder, S. T., Retief, F. P. & Witts, L. J. Gut 1960, 1, 326–336
- Callender, S. T. & Spray, G. H. Brit. J. Haemat. 1962, 8, 230–240
- Chanarin, I. The Megaloblastic Anaemias. Blackwell Scientific Publications, Oxford and Edinburgh, 1969
- Creutzfeldt, W., Arnold, R., Creutzfeldt, C., Feurel, G. & Ketterer, H. Europ. J. Clin. Invest. 1971, 1, 461–479
- Doniach, D. & Roitt, I. M. Brit. Med. J. 1963, I, 1374–1379
- Dotevall, G., Rohrer, V., Stefco, P. & Price, W., Amer. J. Dig. Dis. 1967, 12, 1230–1239
- Ganguli, P. C., Cullen, D. R. & Irvine, W. J. Lancet 1971, I, 155–158
- Ganguli, P. C., Henderson, J. T. & Shearman, J. C. Gut 1972, 13, 320
- Glass, G. B. J. & Pitchumoni, C. S. Hum. Pathol. 1975, 6, 219–250
- Howitz, J. & Rehfeld, J. F. Lancet 1974, II, 1399–1400
- Hutner, S. H., Bach, M. K. & Ross, G. I. M. J. Protozool. 1956, 3, 101–112
- Ivey, K. J. Med. Clin. N. Amer. 1974, 58, 1280–1304
- Korman, M. G., Strickland, R. G. & Hansky, J. Brit. Med. J. 1971, 2, 16–18
- Lundqvist, G. & Wide, L. 1976. To be published
- McGuigan, J. E. & Trudeau, W. L. New Engl. J. Med. 1970, 282, 358–361
- Miederer, S. E., Stadelmann, O., Kaess, H. & Elster, K. Verh. Dtsch. Ges. Inn. Med. 1973, 79, 823–825
- Oden, A. & Wedel, H. Annals of Statistics 1975, 518–520
- Polak, J. M., Hoffbrand, A. V., Reed, P. I., Bloom, S. & Pearse, A. G. E. Scand. J. Gastroent. 1973, 8, 361–367
- Rehfeld, J., Stadil, F. & Rubin, B. Scand. J. Clin. Lab. Invest. 1972, 30, 221–232
- Siurala, M. & Tawast, M. Acta Med. Scand. 1956, 153, 451–458
- Siurala, M., Eraemaa, E. & Nyberg, W. Acta Med. Scand. 1960, 166, 213–223
- Siurala, M., Lehtola, J. & Ihamäki, T. Scand. J. Gastroent. 1974, 9, 441–446
- Strickland, R. G., Bathal, P. S., Korman, M. G. & Hansky, J. Brit. Med. J. 1971, 4, 451–453
- Strickland, R. G. & Mackay, I. R. Amer. J. Dig. Dis. 1973, 18, 426–440
- Strickland, R. G. Lancet 1975, 1, 458
- TeVelde, K., Hoedemaker, P. J., Anders, G. J. P. A. & Nieweg, H. O. Gastroenterology 1966, 57, 138–148
- Wide, L. & Killander, A. Scand. J. Clin. Lab. Invest. 1971, 27, 151–159
- Yalow, R. S. & Berson, S. A. Gastroenterology 1970, 58, 1–14