TY  - JOUR 
T1  - Compact and user-friendly ultrasound acquisition systems optimized for field recording
JO  - Anais da Academia Brasileira de Ciências
A1  - Specht, Raimund
SN  - 0001-3765
UL  - 10.1590/S0001-37652004000200040
VL  - 76 
Y1  - 2004
PB  - Brasil 
ER  -