Pradelli, Lorenzo, and Orietta Zaniolo. “Perceval Sutureless Valves in Isolated and Concomitant AVR Procedures: An Economic Model Shows Overall Decrease of Costs for Isolated or Combined Operations”. Farmeconomia. Health Economics and Therapeutic Pathways, vol. 13, no. 4, Dec. 2012, pp. 159-74, doi:10.7175/fe.v13i4.282.