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2. Cross-sectional echocardiographic examindemonstration of right to left shunting or negative ation of the interatrial septum;Dillon, J.C.; Weyman, A.E.; Feigenbaum, H.; Eggleton, R.C.; Johnston, K.;Circulation; 55: contrast effect may have a place in the differentiation 115-20,1977
3. Circulation 1977; 56: 447-56.
4. Apex echocardiography: a two-dimensional technique for evaluating congenital heart disease;Silverman, N.H.; Schiller, N.B.;Circulation,1978
5. Subxiphoid two-dimensional imaging of the interatrial septum in infants and neonates lished in this study for the uncomplicated secundum with congenical heart disease;Bierman, F.Z.; Williams, R.G.;Circulation,1979