1. Walker, M. B.: Lancet1934 I, 1200.
2. Laurent, L. P. E., andM. B. Walker: Lancet1936 I, 1457.
3. Laurent, L. P. E., andW. W. Walther: Lancet1935 I (1934).
4. Grob, D., J. L. Lillienthal.,A. M. Harvey, B. F. Jones andS. A. Talbot: Bull. Johns Hopkins Hosp.81, 217, 267 (1947).
5. Grob, D., andA. M. Harvey: Bull. Johns Hopkins Hosp.84, 532 (1949).