1. An attempt on the intracardiac phonocardiography;Yamakawa;Toboku J Exp Med,1953
2. Intracardiac phonocardiography;Yamakawa;Am Heart J,1954
3. Ribbon condenser hydrophones;Wallace;J Underwater Acoustics,1956
4. Intracardiac phonocardiography in man;Lewis;Circulation,1957
5. La phonocardiographie intra-cardiaque chez l’homme;Feruglio;Arch Mal Cœur Vaiss,1959