1. Archibald, E. (1919).Surg. Gyn. Obst., 28, 529.
2. Bancroft (1932).Amer. J. Surg., 16, 223.
3. Capper and Tovey (1954).Brit. Med. J., i, 46.
4. Cattell and Warren (1953).Surgery of the Pancreas. Saunders.
5. Devine (1928).Surg. Gyn. Obst., 47, 239.