3) Björk, V. O. et al.: The Björk-Shiley mitral valve prosthesis, Ann. Thorac. Surg. 18 (1974)
4) Scotten, L. N. et al.: New tilting disc cardiac valve prosthesis, In vitro comparison of their hydrodynamic performance in the mitral position, J Thorac. Cardiovasc. Surg. 82 (1981)