Jaumin, P., Cosyns, J.-P., Rubay, J., Mignon, T., Goenen, M., Kestensservaye, Y., De Jonghe, D., Kremer, R., Schoevaerdts, J.-C., Ponlot, R., & Chalant, C. (1984). [Cardiac-valve Surgery After 65]. Annales de cardiologie et d’angéiologie, 33(6), 357-360. https://hdl.handle.net/2078.5/142755 (Original work published 1984)