TY  - RPRT
TI  - Cardiac valve replacement. Problems solved and unsolved.
AU  - H G Borst
AU  - N Papagiannakis
AU  - C Bedderman
AU  - H Oelert
PY  - 1979
DO  - 10.1055/s-0028-1096223
UR  - https://pubmed.ncbi.nlm.nih.gov/451983/
ID  - 451983
ER  -