Kidao, JVijayaraghavan, GDurairaj, MSukumar, I PCherian, G1977-01-012009-05-271977-01-012009-05-271977-01-01Kidao J, Vijayaraghavan G, Durairaj M, Sukumar IP, Cherian G. The second heart sound in secundum atrial septal defect a phonocardiographic study with haemodynamic correlations. Indian Pediatrics. 1977 Jan; 14(1): 55-60http://imsear.searo.who.int/handle/123456789/11999engAdolescentAdultChildFemaleHeart Septal Defects, Atrial --diagnosisHemodynamicsHumansMalePhonocardiographyPulmonary CirculationJournal Article