1. Borger, M.A., et al.: Twenty-year results of the Hancock II bioprosthesis. J. Heart Valve Dis. 15(1), 49–55 (2006)
2. Walther, T., et al., Transapical minimally invasive aortic valve implantation: the initial 50 patients. Eur J. Cardiothorac. Sur. Official J. Eur. Assoc. Cardiothorac. Sur, 33(6), 983–998 (2008)
3. European Society of Cardiology, Cardiovascular Research and Nutrition, cardiovascular disesease.
http://cardiovascres.oxfordjournals.org/content/73/2/253.full#ref-4
4. Lecture Notes in Computer Science;E Yeniaras,2011
5. Chan, T.F., Vese, L.A.: Active contours without edges. IEEE Trans. Image Process. 10(2), 266–277 (2001). (Citeseer)