1. Bricker, E. M.: Surgery. 32, 372–383 (1952).
2. Cook, R. C. M., Lister, J., Zachary, R. B.: Surgery. 63, 825–831 (1968).
3. Eckstein, H. B., Boyd, J.: Z. Kinderchir. 7, 507–514 (1969).
4. Eckstein, H. B., Kapila, L.: Brit. J. Urol. 42, 306–315 (1970).
5. Eckstein, H. B., Mohindra, P.: Dev. Med. Child Neurol. 12, Suppl. 22, 46–50 (1970).