B. . Ferreira Taino, I. D. . Bezerra Nogueira, M. A. . de Oliveira, and P. A. de Miranda Silva Nogueira, “The Prone position in cardiophatic patients: a literature survey: DOI: 10.15343/0104-7809.200832.1.9”, Mundo Saude, vol. 32, no. 1, pp. 70–73, Jan. 2008.