TY  - JOUR 
T1  - Amazon landforms and soils in relation to biological
          diversity
JO  - Acta Amazonica
A1  - Sombroek, Wim
SN  - 0044-5967
UL  - 10.1590/1809-43922000301100
VL  - 30 
Y1  - 2000
PB  - Brasil 
ER  -