TY  - JOUR 
T1  - Mechanical versus biological aortic valve implants in the elderly. A comparison of early and mid-term results
JO  - Arquivos Brasileiros de Cardiologia
A1  - Thulin, Lars I.
A1  - Sjögren, Johan L.
SN  - 0066-782X
UL  - 10.1590/S0066-782X2001001100001
VL  - 77 
Y1  - 2001
PB  - Brasil 
ER  -