2C.Fucci, L.Sandrelli, L.Torrcca, et al.Improved results with mitra valve repair using new surgical techniques. Eur J Cardi-thoracia Surg, 1995,9:621-627.
3Maisano F,Torrcca L,Oppizzi M,et al. The edge -to -edge technique:a simplified method to mitral insufficiency. Eur J Cardio-thoracia Surg, 1998,13:240-246.