RT Journal Article SR Electronic T1 Strut fracture of the convexo-concave Björk-Shiley mitral valve prosthesis. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 703 OP 703 DO 10.1136/hrt.74.6.703 VO 74 IS 6 A1 C. M. Oakley YR 1995 UL http://heart.bmj.com/content/74/6/703.abstract AB