TY  - JOUR 
T1  - Megaspores from coals of the Triunfo Member, Rio Bonito Formation (Lower Permian), northeastern Paraná State, Brazil
JO  - Anais da Academia Brasileira de Ciências
A1  - RICARDI-BRANCO, FRESIA
A1  - ARAI, MITSURU
A1  - RÖSLER, OSCAR
SN  - 0001-3765
UL  - 10.1590/S0001-37652002000300011
VL  - 74 
Y1  - 2002
PB  - Brazil 
ER  -