1. Allanby, K. D., and Campbell, M. (1949). Guy's Hosp. Rep., 98, 18.
2. Blount, S. G. Jr., McCord, M. C., Mueller, H., and Swan, H. (1954). Circulation, 10, 161. --, Van Elk, J., Balchum, 0. J., and Swan, H. (1957). Circulation, 15, 814.
3. Guy's Hosp;Brock, R.C.;Rep,1955
4. The Anatomy of Congenital Pulmonary Stenosis;Brock, R.C.,1957
5. Brock, R. C., and Campbell, M. (1950). Brit. Heart J., 12, 420.