%0 Journal Article %A V O Björk %A I Cullhed %T Functional results with aortic ball valve prostheses (Starr-Edwards) followed for two to three years. %D 1967 %R 10.1136/thx.22.1.21 %J Thorax %P 21-24 %V 22 %N 1 %U https://thorax.bmj.com/content/thoraxjnl/22/1/21.full.pdf