TY  - JOUR 
T1  - Time dependency of hydrogen - ion concentration and electric conductivity measurements in river water samples of Central Amazonia<sup>(</sup><sup>)</sup>
JO  - Acta Amazonica
A1  - Brinkmann, W.L.F.
A1  - Santos, A. dos
SN  - 0044-5967
UL  - 10.1590/1809-43921971012057
VL  - 1 
Y1  - 1971
PB  - Brasil 
ER  -