TY  - JOUR 
T1  - Differences in stomatal number per unit area within the same species under different micro-environmental conditions: A working hypothesis
JO  - Acta Amazonica
A1  - Lleras, Eduardo
SN  - 0044-5967
UL  - 10.1590/1809-43921977074473
VL  - 7 
Y1  - 1977
PB  - Brasil 
ER  -