TY  - JOUR 
T1  - Preparation of silica by sol-gel method using formamide
JO  - Materials Research
A1  - Lenza, R.F.S.
A1  - Vasconcelos, W.L.
SN  - 1516-1439
UL  - 10.1590/S1516-14392001000300008
VL  - 4 
Y1  - 2001
PB  - Brasil 
ER  -