TY  - JOUR 
T1  - Size variation in the vascular cambium and its derivatives in two Alstonia species
JO  - Acta Botanica Brasilica
A1  - Khan, Moin A.
A1  - Siddiqui, Badruzzaman
SN  - 0102-3306
UL  - 10.1590/S0102-33062007000300003
VL  - 21 
Y1  - 2007
PB  - Brasil 
ER  -