J Hofmeister

Freehand subcoronary aortic valve and aortic root replacement with cryopreserved homografts: intermediate term results.

A. C. Yankah, P E Lange, R Hetzer, 1996, The Journal of heart valve disease.

Surgical treatment of active infective aortic valve endocarditis with associated periannular abscess--11 year results.

A. C. Yankah, R Hetzer, M Loebe, 2000, European heart journal.