Fragata, J. I., Rebocho, M. J., Melo, J. Q. and Macedo, M. M. (1985) “Prognostic value of simple chest radiography for the establishment of risk factors in open mitral valve surgery”., Acta Médica Portuguesa. Lisbon, Portugal, 6(3-4), pp. 115–120. doi: 10.20344/amp.3671.