TY  - JOUR 
T1  - Diversification of Ramphastinae (Aves, Ramphastidae) prior to the Cretaceous/Tertiary boundary as shown by molecular clock of mtDNA sequences
JO  - Genetics and Molecular Biology
A1  - Nahum, Laila Alves
A1  - Pereira, Sérgio Luiz
A1  - Campos Fernandes, Flora Maria de
A1  - Russo Matioli, Sergio
A1  - Wajntal, Anita
SN  - 1415-4757
UL  - 10.1590/S1415-47572003000400003
VL  - 26 
Y1  - 2003
PB  - Brasil 
ER  -