de Lima, R., Antunes, A.M., Cravino, J., Velho, H.V., Roquette, J. and Macedo, M.M. 1980. Valve substitutes in cardiac surgery. Acta Médica Portuguesa. 2, (Dec. 1980), 95–107. DOI:https://doi.org/10.20344/amp.4201.