1. COURTNEY, H. (1950), Amer.
2. , Lancet, MILLIGAN, E. T. C., MORGAN, L. E., and OFFICER, R. (1937), C. N.
3. Lancet, ii, (I1I9I394)., JONES, MORGAN, N. C., and THOMPSON, H. R. (1956), Ann. roy. Coll. Surg. Engl., I9, 88.
4. PARKS, A. G. (1956), Ibid., 44, 209.
5. Problems Pelvis,;UHLENHUTH, E.,1953