Alves da Silva, J. D., Santos, A. L., Nogueira, J. B., Soares-Costa, J. T., da Costa, J. N., & Alves da Silva, C. L. (1981). Effect of arterial hypertension on the atria. Phonomechanocardiographic study of hypertensive patients of different clinical gravity. Acta Médica Portuguesa, 3(3), 185–193. https://doi.org/10.20344/amp.3887