1. Ultrasound cardiography in mitral valve stenosis;Edler;Am J Cardiol,1967
2. Suprasternal ultrasonography;Goldberg;JAMA,1971
3. Echocardiography, p 216, Table A-1;Feigenbaum,1972
4. Echocardiography;Feigenbaum,1972
5. Clinical Cardiac Roentgen Diagnosis;Jacob,1972